historical review Thomas Addis of Edinburgh (1881–1949) and the coagulation cascade: ‘for the greatest benefit done to practical medicine’ Derek Doyle Retired Consultant in Palliative Medicine, Edinburgh, UK Summary Thomas Addis came of evangelical Scots stock; he was brought up to care for others less fortunate than himself, to know what he believed in and to defend it vigorously. Trained at the turn of the 19th and 20th centuries in a Scotland still recovering from wars and ecclesiastical schisms, yet producing record numbers of missionaries and many social improvements, he was a brilliant haematologist and innovative researcher. Moving to Stanford his career continued to blossom as a nephrologist whilst his concern for the less fortunate found expression in his espousal of communist principles. Only in his later years was he finally honoured for his many contributions to medicine, science and social issues. Keywords: Thomas Addis, coagulation cascade, Edinburgh, Free Church of Scotland. Thomas Addis (1881–1949) (Fig 1) was one of those rare men for whom superlatives are appropriate. An Edinburgh pioneer in the fields of haemophilia and coagulation and, after moving to California, a famous nephrologist, he was a consummate researcher, teacher and caring physician, a medical giant of the 20th century. This paper looks at his life and work in the context of his remarkable family, the social and ecclesiastical history of his times, his professional contemporaries and his complex personality and character. He challenged and changed current medical practice, sought to improve society and was, towards the end of his eventful life, honoured and rewarded by his peers, his pupils and his patients. The coagulation cascade The Coagulation Cascade seems a fitting description for the complex sequence of events on which life itself can depend. The rivalries and mutual criticisms of its researchers makes one wonder if we should not speak rather of Coagulation Conflict! Correspondence: Dr Derek Doyle, OBE, DSc, FRCSEd, FRCP (Lond. and Edin.), FRCGP, 7 Kaimes Road, Edinburgh EH12 6JR, UK. The clotting of the blood has always fascinated man (Ratnoff, 1980). The Greek philosopher Plato speculated about the process (Plato, 1892), believing that fibres in the blood aided clotting as the blood cooled. Aristotle thought the fibres were made of earth, were solid and that blood from which they were removed did not clot (Aristotle, 1952). Malpighi (1686) washed clotted blood and invited people ‘to enjoy the pretty sight’ of the white fibres. Little more was learnt until the 1770s when Hewson localised the source of the fibres to what he termed the ‘coagulable lymph’, the liquid part of the blood we now call plasma (Hewson, 1846). He was born in Hexham in 1739, became a surgeon partner of William Hunter and died at age 34 as a result of an infection acquired in the dissecting room. Hewson showed that cooling blood slowed the clotting process whilst other researchers showed that coagulation took place most rapidly at body temperature. Hewson’s theory that clotting took place when blood came into contact with air was disproved by John Hunter, William’s brother, who demonstrated that it could happen in a vacuum (Hunter, 1817). The name fibrin was first used by Chaptal (1797), who lived and worked at the time of the French Revolution. He postulated that the blood remained fluid because fibrin was continually being removed, perhaps as a source of nutrition. The next challenges were to define what effect temperature and motion had on fibrin, how chemicals affected it and, more importantly, where the fibrin came from. Some suggested that fibrin was formed in rough areas in blood vessel walls, a theory disproved by the German pathologist Rudolph Virchow when he introduced a drop of mercury into a blood vessel and produced coagulation (Virchow, 1856). Others postulated that clotting was related to motion and rest, a theory first disproved by Thackray (1819) followed by many others who showed that clotting occurred very slowly in a segment of vein between two ligatures. Wrote Thackray, ‘the loss of motion is not in itself the cause of coagulation’, a view supporting that of Hewsen: ‘rest of itself does not in the least assist the coagulation of the blood’ (Hewson, 1846). The first hints that fibrin might not be a constituent of normal blood but be formed from, or as a result of, some other substance came with the work of Babington (1830) and E-mail: [email protected] doi:10.1111/j.1365-2141.2005.05854.x ª 2005 Blackwell Publishing Ltd, British Journal of Haematology, 132, 268–276 Historical Review Addis and coagulation Fig 1. Thomas Addis (1881–1949). Reproduced with permission of Lane Library, Stanford University, CA. Richardson (1858) who suggested that it might be formed from a precursor called fibrinogen, first isolated from plasma by de Commercy (Denis, 1858) and defined by Hammersten (1911), its name being popularised by Virchow (1856). The next challenge – to define the structure of fibrinogen and identify what converted it to fibrin – was taken up by Buchanan, professor of physiology at the University of Glasgow (Buchanan, 1879–80), and Schmidt (1892) of Estonia who identified the converting agent, calling it fibrin ferment, later to be renamed thrombin. Realising that thrombin could not exist in normal circulating blood he postulated that it too must have a precursor during clotting, a substance that came to be called prothrombin. The search began to learn more about prothrombin. In 1905 (the year Addis qualified) Paul Morawitz, then an assistant physician in the Medical Clinic, Strasburg, described what he called the extrinsic pathway of coagulation. There were, he said, two stages in the process, the first where thromboplastin from damaged tissue changed prothrombin (which he believed originated in platelets) to thrombin and the second where fibrinogen converted to fibrin, calcium being needed only for the first stage (Morawitz, 1905). Woolridge, a contentious assistant physician at Guy’s in London, with little time for anyone who disagreed with him, asserted that blood contained A-fibrinogen and B-fibrinogen, each composed of protein and lecithin (Woolridge, 1893; Morawitz, 1905). Howell, working in Baltimore, believed that thrombin came directly from damaged tissues and white cells and, particularly after the discovery of heparin, his views and those of Morawitz diverged (Howell, 1935), Howell being convinced that clotting depended on the overcoming of inhibitors, but that and the discovery of the many ‘factors’ we know today were to be long after Thomas Addis came on the scene for a few years. Addis will be remembered in Edinburgh primarily for his work on clotting time and haemophilia, work begun when he joined the University Department of Physiology in the University of Edinburgh after his house jobs. It will be recalled that in 1906, the source of thromboplastin and prothrombin was still hotly debated, there was no reliable method of estimating coagulation time (Addis, 1908), no one knew whether or not calcium salts had any part to play in coagulation, haemophilia was a mystery (Addis, 1910a), no one knew whether or not blood transfusion would help haemophiliacs, none of today’s ‘factors’ had been identified and blood groups were unknown [they were not even mentioned in Crile’s textbook on transfusion (Crile, 1909)]. Addis addressed almost all of them (Addis, 1910a). His MD thesis (Addis, 1908) was on normal human blood, important because until then no consistently reliable method of estimating coagulation time had existed. He modified a somewhat cumbersome but reliable apparatus, first devised by McGowan (working in the RCPEdin. laboratory), later trying it out on patients in Gloucester and Bristol (Figs 2 and 3; Addis, 1910a). In his own words ‘When a current of oil streams against the edge of a drop of blood suspended in oil, a continuous smooth flow of the corpuscles is induced, although the drop as a whole does not rotate. Under the microscope this flow will be seen to cease quite suddenly after a certain time has elapsed. This is due to the occurrence of coagulation in the drop. This method is a modification of Brodie and Russells’ method. Instead of intermittent jets of air at an unknown and variable temperature, a continuous stream of oil at a known and constant temperature is used. The end point also is entirely different.’ He was able to demonstrate the influence of temperature and dismiss any diurnal aspect of clotting. He showed that oral calcium and citrate had no effect on clotting, contrary to what Sir Almoth E. Wright had said (Wright, 1893), and Addis said so in no uncertain terms, somewhat tactlessly. ‘By means of a more accurate method than Sir A E Wright’s I have shown that he was mistaken in his statement that soluble calcium salts and citric acid are capable of altering the coagulation time of the blood of people in health….’ Addis had been qualified less than 3 years! Not afraid to challenge accepted theory, Addis also showed that plasma contained complement, in contrast to Gengou’s theory that it derived from white cells (Addis, 1912). Further controversy, this time acrimonious, erupted when he addressed the Pathology Section of the British Medical Association (BMA) in July 1910. After giving notice of what he planned to say he claimed that the fault in haemophilic blood lay in an inherited qualitative defect in the prothrombin. The Swiss haematologist, Hermann Sahli of the eponymous haemoglobulinometer (1856–1933), was in the audience and disputed Addis’s claim, saying that, as he himself had proved, washed corpuscles of haemophilic blood accelerated clotting ª 2005 Blackwell Publishing Ltd, British Journal of Haematology, 132, 268–276 269 Historical Review Fig 2. Addis’s apparatus for estimating clotting time. P, large glass bottle containing paraffin oil suspended from an upright, so that it can be raised or lowered; Sc, scale on upright; p, flexible metal tubing leading the oil from the glass bottle to the spiral (sp) contained within the water vessel (V); t, metal tube continuous with the spiral and emerging from the water tank at the level of the microscope stage; ch, Bogg’s coagulometer chamber with thermometer (th) inserted into it; r, reservoir into which the overflow of oil from the stage is received; w, waste tube by which oil from r is removed; R, Schafer’s thermostat (gas regulator); g, rubber tube from gas tap; g¢, rubber tube from thermostat to gas burner under the water vessel. Reproduced from Addis (1908). proving that the defect lay in the corpuscles. Addis retorted that Sahli’s washing technique had obviously been inadequate! (Addis, 1910b, 1911). One cannot discuss the measurement of clotting time or the mechanism of clotting without turning to haemophilia. It had fascinated and puzzled observers for many years (Immerman, 1878). In 1819, a surgeon by the name of Ward suggested it was due to a defect in the clotting mechanism (Wardrop, 1837). At the end of that century, George Hayem agreed with that but, because there was no satisfactory method of measuring clotting time, did not pursue the matter (Hayem, 1856). Koch (1905) of bacteriology fame regarded it as a manifestation of scurvy whilst others saw it as a feature of rheumatoid arthritis, excessive thinness of blood vessel walls, and, because it only affected males, a form of vicarious menstruation. By 1878 efforts were being made to devise a reliable means of measuring clotting time, essential if haemo270 Fig 3. Addis’s apparatus for estimating clotting time (close-up view). In addition to the parts identified in Fig 2: This gives a closer view of the stage apparatus. The lid of the Bogg’s coagulometer (ch¢) has been taken off, and the glass cone with its truncated apex, from which the drop of blood hangs, is shown. Reproduced from Addis (1908). philia was to be studied. Wright (1893) explained the condition by saying the clotting time was abnormally high in the condition; also in 1893 Manteufel (a student of Schmidt’s) reported that tissue extracts (Schmidt’s ‘zymoplastic substance’) shortened the clotting time of haemophilic blood (Manteuffel, 1893). In 1910, on the day of King Edward VII’s funeral, Addis gave the first ever transfusion of fresh anticoagulated blood to a haemophiliac patient. On another occasion he gave a patient 15 cm3 of 96-h-old human serum and showed acceleration of clotting but found that normal or antidiphtheritic horse serum older than 5 weeks, given i.v., had no measurable effect. Three months later, following Weil’s use of 20 cm3 i.v. antidiphtheritic horse serum in a 40-year-old about to have surgery for an abscess and his subsequent recommendation that it be used routinely for haemophiliacs pre-operatively, Addis gave a patient 8 cm3 i.v. of human serum, accelerating the clotting time but not as successfully as after blood transfusion (Boulton, 2003). Addis was familiar with phosphate, possibly because it had been used in Edinburgh since the 1880s to anticoagulate blood prior to transfusion and possibly because he had discussed it with Cotteril (President of the Royal College of Surgeons of ª 2005 Blackwell Publishing Ltd, British Journal of Haematology, 132, 268–276 Historical Review Edinburgh 1907–10) who, in the year Addis graduated, had given him a career testimonial (Rabe & Solomon, 1920; Risak, 1935; Imperato & Dettori, 1958; Addis, 1910b). Without doubt his seminal paper was that published early in 1911 when he was settling in at Stanford (Addis, 1910b). The conclusions are worth quoting in full: 1 Fibrinogen is present in as large amount in haemophilia as in normal blood. Haemophilic fibrinogen is as readily coagulated by thrombin as normal fibrinogen. 2 The amounts of thrombin developed in the complete coagulation of the same quantities of haemophilic and normal blood are equal. Haemophilic thrombin is as active in coagulating fibrinogen as normal thrombin. The rate of formation of haemophilic thrombin is slower than that of normal thrombin. The degree of this retardation in formation is proportional to the degree of delay in the coagulation of the blood. The proximate cause of the delay in coagulation is the slowness of the formation of haemophilic thrombin. 3 There is no appreciable difference between the antithrombin content of haemophilic and normal blood. 4 There is no substance in haemophilic blood, not present in normal blood, which hinders the formation of thrombin. 5 There is no appreciable difference in the amount or activity of calcium in haemophilic and normal blood. 6 Haemophilic thrombokinase, derived either from the formed elements of the blood or from the tissue cells, is as abundant and active as normal thrombokinase. 7 Prothrombin is present in as large amount in haemophilic as in normal blood. There is a defect in haemophilic prothrombin which reveals itself in the longer time it requires for the change into thrombin, in the presence of thrombokinase and calcium. This qualitative defect in the prothrombin is the cause of the delay in coagulation of haemophilic blood. Boulton (F. Boulton, personal communication) is in no doubt that Addis anticipated the standard clotting tests – prothrombin time and partial thromboplastin time – and also the tests for clotting inhibitors in plasma by double dilutions. His study of Addis’s papers leads him to believe that Addis was on the verge of assaying ‘antihaemophiliac’ activity in plasma. Howell was able to show that Addis had been wrong in believing that there is a defect in haemophilic prothrombin (Howell, 1935; Bordet, 1921), 24 years later. It fell to those who followed Addis and continued in haemophilia research, well into the 20th century, to define the antihaemophilic factor and its defects. By then Addis was making his mark as a nephrologist (Quick, 1943; Quick et al, 1935; Risak, 1935; Seegars, 1962). Addis the nephrologist What made Addis accept the 1910 invitation of Dr Ray Lyman Wilbur, Dean of the newly established Medical School in Stanford, to leave Edinburgh and work in California, not in haematology but in nephrology? We know Lyman was encouraged to invite him by Sir Clifford Allbutt, Regius Professor of Physics at Cambridge, who had been at the conference where Addis and Sahli had crossed swords. Did Addis feel undervalued, his work not recognised, particularly by Gulland and Goodall, both to become Professors of Medicine and Presidents of the RCPEdin? In fact, Gulland and Goodall (1911) said haemophilia was due to ‘an inherited abnormality in the structure of the prothrombin of the blood’ but persisted for the next 11 years in recommending high doses of calcium and injections of serum. Hutchison, writing from the London Hospital in 1912, quoted Addis but still recommended blood transfusion (Hutchison, 1912). Was Addis troubled by the war clouds gathering over Europe or the crescendo of discontent in Russia? Were his developing left wing views, so prominent later, making him uncomfortable with Scotland’s poverty and social malaise? Did he feel liberated from dogmatism and doctrinal ties now that his grandfather, grandmother and mother had died? Had he already met the American lady he was to marry in 1913? Perhaps the reason for his move was simply his wanting to exchange the old albeit historic building where he did his research for a new and exciting one of almost unlimited possibilities in a climate considerably more attractive that that in which he had grown up, a chance to work in a new medical school, well funded, dedicated to research and under the charismatic leadership of Wilbur, with the possibility of being offered a professorship? Whatever the reason, he went to Stanford in spring 1911, his departure marked in the archives of the Physicians laboratory by a brief hand written note – Tom Addis left for California. Surprisingly, in view of the importance of his research work and the impact his findings made, Addis published only 10 papers when based in Edinburgh, but they were all within 6 years of qualifying, a feat seldom achieved or achievable today. In the 30 plus years he worked in California (Fig 4), he published no less than 131 papers (Anonymous, 1954) and one outstanding book. Most doctors will know of him because of the ‘Addis count’, the ‘Addis formula’ or the ‘Addis–Shevky concentration test’. His work on nephritis (Bright’s Disease) was as innovative and important as his work on haemophilia. He pioneered the ‘protein-poor-but-not-protein-free’ diet, no doubt in consultation with his dietician wife. His book Glomerular Nephritis: Diagnosis and Treatment (Addis, 1948) gives a more complete picture of the man, his research and his philosophy of life than any paper such as this one could ever do. After being naturalised he served as a Captain in the US Army Medical Corps (1917–19) and as consultant to the Surgeon General (1942–45). He and his wife had two daughters, the elder one marrying David Karnowski, an oncologist, and the younger studying with the Bolshoi Ballet (F. Boulton, personal communication). ª 2005 Blackwell Publishing Ltd, British Journal of Haematology, 132, 268–276 271 Historical Review Fig 4. Addis (complete with pipe) in his Stanford Laboratory. Reproduced with permission of Lane Library, Stanford University, California. How can we describe him? Totally dedicated to his patients and the highest standards of medical care and research, a selfassured and a formidable exponent and defender of his theories who may sometimes have appeared arrogant but was usually justified in his confidence; a man whose life reflected the myriad influences of his childhood and background but whose thinking and vision were ahead of his time (Peitzman, 1990). What were these influences that made such a man? The family of Thomas Addis So profound were the influences of Addis’s family on him, his life and work that we must go back many years before he was born and see them in the context of a rapidly and dramatically changing society, in that respect not unlike the days in which we live today. Addis’s paternal great grandfather, born of Methodist parents in London, subsequently worked in Edinburgh as a plumber, through the time of the French Revolution and Napoleonic Wars. He may well have seen French prisoners-ofwar (PoW) being taken to Edinburgh Castle or the Bass Rock in the Firth of Forth, both at that time prisons for PoW as well as religious dissenters. In 1814, his son Thomas, was born, the boy who was to become a leading divine in the Free Church of Scotland as well as grandfather of the central figure in this paper. Young Thomas went to St Andrews University and Divinity Hall, graduating and being ordained as a minister in 1841, a 272 momentous time in the ecclesiastic history of Scotland. Many felt that the national church – the Church of Scotland – was too much influenced by the government and, in theory, by the sovereign, its nominal head. In 1843, one-third of the ministers of the Church of Scotland walked out of its General Assembly and formed a new church – The Free Church of Scotland. The young Rev. Thomas Addis was one of them, probably influenced by Rev. Professor Thomas Chalmers, one of his parishioners and the driving force behind the schism. After this dramatic split in the church he returned to his parishioners, a large number of whom elected to remain with him as their young minister though now without a church building, calling themselves Morningside Free Church of Scotland. For a short time, they used Dr Chalmer’s house in which to worship, filling rooms on the ground and first floors while the minister preached standing on the stairs, in the summer occasionally using a marquee in a nearby field. During the 56 years of his ministry, Addis built no less than three churches: one in the 1850s, one in the 1870s (the current Baptist Church) and in 1892, when preparing to retire, a large church, which, by 1965, had been converted into a theatre! What was once The Free Church Schoolhouse was soon too small for all the children and became the Brethren Meeting Place, when the Free Church children moved to larger premises (Smith, 1982). Awarded a Doctorate in Divinity towards the end of his long ministry, he died in 1899. In 1842, he had married Robina Stewart Thorburn, the daughter of a Leith merchant and the half-niece of the Church of Scotland minister there when Thomas was his assistant. They had 12 children in the first 19 years of their marriage, ten surviving into adulthood. However, the effects of his dominating personality were soon evident. William, the first-born son became a Roman Catholic, then an Unitarian and finally an Anglican priest. Robina, named after her mother, married a minister of the Church of Scotland. Charles (1861–1945) the youngest of the 12 children left Edinburgh Academy at the age of 15, no longer able to endure his father’s overbearing authoritarianism (often demonstrated by his use of the cane). He worked in commerce before moving into banking, learning Mandarin Chinese whilst in Shanghai, and eventually becoming a Chairman of the Hong Kong Shanghai Banking Corporation and a valuable trade envoy between Britain and China at a difficult time in their relations. For this he was made a knight commander of St Michael and St George (KCMG) and a Fellow in Chinese studies at Oxford. He married Eba (Elizabeth) McIsaac in 1894 when he was 33. The first of their 15 children was another Thomas, born in 1895. Yet another son of the divine was Thomas Chalmers Addis Jr, his middle name honouring the Rev. Dr Thomas Chalmers. Thomas Addis Jr was to be the father of our ‘hero’, Thomas. He too never went on to university but, at the time of his son Tom’s birth, was ‘a clerk 1st class’ in the Solicitor’s Department of the Inland Revenue eventually earning £1000 p.a. He had a ‘Damascus Road conversion’ during Evangelistic Missions to Edinburgh in the 1870s. Like his son, he married an ª 2005 Blackwell Publishing Ltd, British Journal of Haematology, 132, 268–276 Historical Review Fig 5. George Watson’s College, Edinburgh, shortly before Addis studied there. Reproduced with permission of George Watson’s College. American lady, Cornelia Beers Campbell, daughter of a New Orleans cotton merchant who, after the Civil War moved his family to Hobroken in New Jersey. She died in 1901 aged 56 of carcinoma of stomach. Though his father, uncle and cousins attended The Edinburgh Academy, Tom Addis the 3rd, the focus of our attention, went to George Watson’s College (Fig 5), at that time adjacent to the Royal Infirmary of Edinburgh, beside the Medical School. Watson’s, originally called a ‘hospital school’ had been founded in 1724 by the first accountant of the newly created Bank of Scotland. When his grandfather died in 1899, his grandmother in 1900 and his mother in 1901, Tom was preparing to study medicine. In 1905 Thomas graduated as a Bachelor of Medicine (MB), Bachelor of Surgery (ChB), to be followed in 1908 with his Edinburgh Doctor of Medicine (MD) (with merit and a £50 prize) and becoming a Member of the Royal College of Physicians (MRCP) Edinburgh. Between 1908 and 1910 he was a Carnegie Fellow enabling him to visit and work in Berlin and with Morawitz in Heidelberg (who allowed him to transfuse his patients) as well as taking his new equipment for trials on patients back to Gloucester where he had worked after qualifying and to Bristol. The life and times of Thomas Addis What influenced the life and work of Thomas Addis? The most important must have been the disciplined, deeply religious lives of his grandparents and parents. Like all members of this evangelical church they would have regarded the Bible as the literal word of God and been skilled and eloquent in the defence of all they believed and lived for, as Thomas was to be with those who challenged his research. He would have attended Sunday school and at least two church services every Sunday and family prayers every night of the week. The principles of total abstinence from alcohol, celibacy before marriage, restrained language and respectful behaviour at all times as well as practical concern for the less privileged would have been inculcated in him from an early age. The Presbyterian work ethic and social consciousness dominated Scots life and society. Holidays were almost unknown. Boys were taught that personal discipline, academic diligence and the service of God and their fellow men were Christian virtues. It is, therefore, not surprising that as a student Tom worked in the slums and squalid lodging houses of Edinburgh’s Grassmarket and in the Edinburgh Medical Missionary Society’s (EMMS) Dispensary, a charity largely staffed by volunteer medical students providing care to thousands and, at the same time, preparing generations of future medical missionaries. Addis grew up when Scotland was sending abroad more missionaries per capita than any other country, a result of the evangelicalism sweeping the country, culminating in the influential Edinburgh Missionary Conference 1910, yet it was a time when the home church was torn apart by schisms and fundamentalism, the country was either recovering from or preparing for a war and British politics were in the doldrums. ª 2005 Blackwell Publishing Ltd, British Journal of Haematology, 132, 268–276 273 Historical Review Fig 6. Edinburgh’s Bedlam behind all that is left of the old City Wall, a drawing by an unknown artist in 1778. From Smith (1982). The Addis family, and all who lived in the 19th century must have been affected in one way or another by its six wars, the Highland Clearances and the end of the slave trade in Britain and its colonies, both, radically changing the economics of Scotland and the quality of life of many of its people. It is little wonder that so many emigrated. Addis must have been aware that even the laboratory where he worked was steeped in history. In 1887 the Royal College of Physicians of Edinburgh decided to have its own laboratory for the use of Fellows and Members for their clinical work and research. No fees were to be charged. In 1888 they decided against using the Poorhouse and ‘Edinburgh Bedlam’ (Fig 6), built for ‘pauper lunatics’ (Smith, 1982), where the poet Ferguson had died in squalor in 1774 aged 24, considering it too large for their needs, preferring a small property nearer the old Royal Infirmary. The college set aside £1000 p.a. for running costs and paid the Superintendent £650 p.a. By 1895 it realised it needed a larger property and bought the old Bedlam for £7350 (Ritchie, 1953). In 1903 it came under the wing of the Carnegie Trust. Addis produced two papers whilst working there and Gulland and Goodall their paper on Leukaemia and Chloroma (Gulland & Goodall, 1911), as was Goodall’s paper on Haemophilia. Addis would have known that some of his laboratory buildings had been built on what had been the part of Greyfriars’ Churchyard, where 1200 protesting Covenanters had once been incarcerated for their objection to the reintroduction of episcopacy, most to die of exposure, disease or hanging. Scotland had long been a place where men spoke out for what they believed to be right. A man of his time, Addis was clearly serious, disciplined, quietly religious and wedded to his work. Nevertheless, Scot that he was, in America he is said to have never lost his accent, loved his pipe and his golf and, often found that he had 274 insufficient money to pay his tram fare or round of drinks. What would his grandfather and his parents have said about that or his love of ballroom dancing? Finale He was showered with honours in the United States, including being the first Visiting Fellow of the Long Island College of Medicine, Brooklyn, membership of the Association of American Physicians, the National Academy of Sciences, the American Society for Clinical Investigation, a diplomat of the American Board of Internal Medicine and from 1930, a Fellow of the American College of Physicians. In the following year he delivered the fourth course of lectures under the William Sydney Thayer and Susan Read Thayer Lectureship in Clinical Medicine in the School of Hygiene and Public Health, John Hopkins University School of Medicine, Baltimore (Fig 7). Interestingly his few obituaries are, for the most part brief, factually accurate but terse (Bloomfield, 1950; Anonymous, 1954). We might wish to have heard more of his attitude to money, his reluctance to charge fees or accept as a patient anyone who discussed money with him or to have learnt more of his care and concern for disadvantaged Chinese patients (so like his uncle Sir Charles and cousin Sir John Mansfield Addis) and others with whom he remained in touch for many years. One such was Linus Pauling, the double Nobel Laureate, who admired him and nominated him as the first doctor to be elected to the National Academy of Sciences. Do his obituaries reflect the times in which they were written – 1949 and 1950? Addis and his wife never joined the communist party but undoubtedly had strong left wing views and Addis both lectured and wrote on the benefits of communism (F. Boulton, personal communication). Several reports attest to how some policemen who had reason to be ª 2005 Blackwell Publishing Ltd, British Journal of Haematology, 132, 268–276 Historical Review grateful to him for his care forewarned him when a raid was to be made on a Communist Party meeting. McCarthyism was already casting its ugly shadow across America. How has he been remembered in Edinburgh? Certainly not by plaques or busts. The laboratories where he did his original research have all but disappeared and in 2003 a new Royal Infirmary was opened, the fourth to bear its name. In 1942 the Royal College of Physicians of Edinburgh honoured Addis, a medical giant of the 20th century, with one of its most prestigious awards – The Cullen Prize – ‘for the greatest benefit done to Practical Medicine’ – commemorating a giant of the 18th century, William Cullen (Fig 8). Addis is the only Member of the College (as distinct from a Fellow) and the only non-President ever to have been so honoured. A few years later Addis was elected a Fellow of the College. Acknowledgements Fig 7. Addis a few years before his retirement from Stanford. Reproduced with permission of Lane Library Stanford University, California. This paper could not have been written without the generous help of Dr Frank Boulton, the authority on Tom Addis. To him and the relatives of Dr Addis I extend my thanks. I also thank the librarians of the Royal College of Physicians of Edinburgh, The National Library of Scotland and Edinburgh City Libraries, the archivists of George Watson’s College, The College of the Free Church of Scotland, The Edinburgh Academy, the Church of Scotland and the EMMS. References Fig 8. William Cullen (1710–90). Reproduced with permission of the Royal College of Physicians of Edinburgh. Addis, T. (1908) The coagulation of the blood in man. Quarterly Journal of Experimental Physiology, I, 304–344. Addis, T. 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