I. THI NKI NG THO UG HTS A ND HA V I NG CONCEPTS GILBERT RYLE There are ma n y philos ophic al contexts i n wh i c h we need t o determine t he structures, t he types and t he levels of truths and falsehoods; t o consider, f o r ex ample, wh a t mak es i t legit imat e o r i l l e gitimate to inf er one f rom another or to support one by another. I n the course o f such enquiries we of t en need t o consider t he af f iliat ions , types and levels of the concepts int o whic h these truths and falsehoods are analysable. Thus we may need t o determine t hat one concept dif fers f r o m anot her as genus f r o m species. a s species f r o m f ellowspecies, as relat ion f r o m quality, and so on. We c ould c rudely label such problems as «logical» o r «near-logical» problems . There are als o many philos ophic al contexts i n wh i c h we need t o consider problems about t he t hink ing t hat people are, f r o m t ime t o time, actually engaged in — t heir wonderings, doubtings, discoverings and concludings; t heir being surprised o r unsurprised, perplex ed o r unperplexed, careful or careless, inv ent iv e or conservative, and so on. We c ould label such problems as «epistemological» o r «phenomenological» problems . At c ert ain plac es t hes e epis t emologic al o r phenomenologic al questions necessarily int erloc k wi t h those logic al a n d n e a r logic al questions, a n d t h e n w e f i n d ours elv es s omewhat embarras s ed t o describe how the truths and falsehoods and t heir component concepts, that were under investigation i n the f ormer contexts, ent er int o our epistemological accounts of the liv e t hink ing that people really do. For example, t he concepts of planet and orbit are concepts of dif ferent types, both of whic h enter, in different ways, into certain ranges of astronomical truths. O r t he concepts of square root o f and seven are concepts of different types, and both may enter, in dif f erent ways, into arit hmet ic al truths. So, in some way , the as t ronomer engaged i n comparing the orbit of one planet wit h the orbit of another planet is operating wi t h t he concepts o f orbit and planet ; and t he student of arithmetic who, a t a part ic ular moment , i s t ry ing t o f i n d o u t t he number of whic h 7 is the square root, is operat ing wit h the concepts of square root of and seven. But what is inv olv ed i n t his vague notion of «operating wit h concepts» ? Hav e we to say, f or example, that 157 at a certain moment of t heir morning's work the astronomer and the student were i n process of hav ing in mi n d the concepts of orbit and square root of ? What would it be lik e t o be jus t hav ing i n mi n d a concept ? I s there a particular, recollectable experience of hav ing i n mind the concept of square root of ? Can i t occur by itself ? I f not, why not ? Ca n y ou obey me i f I t ell y ou t o dismiss a l l else f r o m your mind and just conceive the concept of square root of ? Why not ? It might be suggested t hat at t he moment s wh e n t he as t ronomer says t o himself, i n his head, o r b i t _..», then, at that moment , he is actively hav ing in mind what the word «orbit» means — provided, of course, that he is t hink ing what he is saying to himself, and not just absent-mindedly parrot t ing t he word. But , f o r one t hing, t his s uggestion does not hing but raise the same question ov er again. Is there a particular, recollectable experience of actively hav ing in mi n d what is s ignif ied b y t he wo r d t hat is c urrent ly c oming of f one's tongue ? We are reminded of the unprosperous attempts made by Locke, Berkeley and Hu me t o locate «ideas» among the recollectable experiences of a person wh o has jus t been t hink ing about something i n particular. A more import ant objection t o this suggestion is this. Suppose y ou are asked t o f ind t he smallest prime number af t er 1300. Y o u begin, perhaps, by selecting the f irs t dozen o r t wo dozen odd numbers t hat run up f rom 1301, since obviously no even number wi l l be a candidate. You t hen eliminat e those ending i n 5 » , since these wi l l be mu l tiples of 5. You t hen eliminat e those t he digit s of whic h add up t o 3 o r mult iples of 3, since these wi l l all be div is ible by 3, and so on. No w in an import ant way, all these operations of yours, being directed t owards t he discovery o f a number greater t han 1300, wh i c h is divisible only by itself and 1, are s omehow operations wi t h the concept of prime number. You are work ing wit h t he concept during the whole five-minutes search, though the phrase «prime number» comes off y our lips, i f at all, only once or t wic e during those f iv e minutes. Similarly, t he concept i f s omehow governs t he wh o l e of a, perhaps lengthy, hy pot het ic al proposition, t hough t he wo r d «if» i s ov er and done wi t h by t he t ime the second wo r d i n the sentence is produced. In short, t he t empt at ion t o postulate t he existence o f special int ellectual acts o r experiences of «concept-conceiving» o r «idea-having» needs t o be resisted, ab init io. I t is not i n t his sort of way t hat t he concept of orbit enters int o the liv e t hink ing of the as t ronomer while he is work ing out t he differences bet ween t he orbit s o f Venus and Mars. A stretch of t hink ing is not a procession of ephemeral incidents of having-concepts-in-mind. There are no such incidents, and i f there 158 were, a mere procession of t hem would not amount t o t hink ing. So now let us approac h the problem f rom a new angle. There was a t ime before whic h I had not got the concept of square root of ; t here was a lat er t ime since when I hav e had it ; and t here was a n int erim period, s hort o r long, during wh i c h i t was not y et quite mine, t hough no longer not mine at all. What ev er it is t hat I possess when I have got the concept of square root of, the ac quiring it is a case of learning something. But there are no separate lessons i n say, legal or arit hmet ic al concepts, separate, t hat is, f r o m lessons i n l a w or arit hmet ic themselves — save that a teacher might t ell his students to learn by heart a bat tery of def init ions o f legal o r arit hmet ic al terms, i n t he s illy expectation t hat retention of these def init ions wo u l d constitute possession of the corresponding legal o r arit hmet ic al concepts. Instead o f as k ing t h e Loc k ean ques t ion H o w d i d w e f o r m t h e abstract idea, o r ac quire t he concept of square root of ? l e t us as k instead What were we unable to do unt il we had acquired it ? I t is at once c lear t hat t he ans wer t o t his question is int eres t ingly general. We were unable, int er alia, t o understand t he question What is t he square root of 16 ?, o r of any ot her number. We were unable t o t ry to decide between t wo riv al answers to this question. We were unable even t o wonder whet her a l l numbers hav e square-roots. W e we r e unable t o inf er f rom t he inf ormat ion t hat 81 is the square of 9, t hat 9 is t he square-root of 81. We were unable t o see t he joke, such as it is, i n «Some vegetables have round roots and some numbers hav e square roots». We we r e unable t o paraphrase sentences c ont aining «square root» int o sentences not c ont aining it. A n d so on. To ac quire t he concept is t o bec ome able t o c ope wi t h t hat i n definite range o f int ellec t ual a n d ev en merely conversational tasks whic h share wi t h one anot her this c ommon feature of hav ing something o r ot her t o do wi t h a number's being what a square number is t he square of . Wh a t has been learned is being ac t iv ely applied when, f o r example, t he jok e is being appreciated, t he c alc ulat ion is being made o r attempted, t he question is understood o r posed, and so on, indef init ely . To t ry to f ind out what is the square root of 289, and t o appreciate the joke, such as it is, about round roots and square roots are t wo bits of v ery dif f erent k inds of t hink ing. They have, certainly, s omet hing quite specific in common. But to point to what they have in c ommon is not to point to a separately recollectable experience or a separately performable act. To b o r r o w an analogy f r o m Plato, wh e n y ou pronounce t he monos y llable «top» a n d I pronounc e t he monos y llable 159 «but», what you have pronounced has indeed s omet hing i n c ommon wit h what I hav e pronounced, namely t he consonant «t». But t here was no separate pronounc ing of a separately audible «t»-noise. As not hing less t han a n int egral s y llable •can be pronounced, y et t wo ot herwis e dif f erent syllables c a n s t i l l hav e s omet hing, e.g. a consonant i n c ommon, s omewhat s imilarly not hing less t han an i n tegral jok e c an be appreciated, a n int egral equat ion be c hallenged or a n int egral arit hmet ic al problem be tackled, y et these ot herwis e very dif f erent int egral int ellec t ual acts c an s t ill hav e s omet hing i n common. e.g. t he concept square root of. We c ould hav e reached t he same negative phenomenologic al c onclusion f r o m t he ot her end, namely f rom t he logic al o r near-logic al end. For we c ould have asked this question: Giv en a sentence whic h conveys a t rut h or a falsehood, say the sentence «I f John is the uncle of Sarah, t hen at least one of Sarah's parents was not an only child», how is the t rut h that the sentence as a whole conveys related to what is signified by the part ic ular words in it ? For example, is the meaning of Rif» or of «uncle» or of «not» a genuine part of this integral t rut h ? Is the t rut h just an assemblage of the several meanings of the several words i n t he sentence ? Familiar considerations s how t hat t his c ould n o t be t he case. For the same words in a different order might have produced a falsehood, or a different truth, or a piece of nonsense. The meanings of the words in a sentence are f unc t ionally interlocking. Concepts are not bricks, out of whic h truths and falsehoods are built , any more t han v owels and consonants are components out of whic h syllables are composed. Rather a concept, say the concept i f or uncle of, is what can be c ommon t o a n indef init e range o f ot herwis e dif f erent int egral t rut hs , falsehoods, questions. commands, entreaties. etc. I t is abstracted f rom them, not extracted out of them. I t is not it s elf an int egral significatum, a n y more t han a consonant is it s elf an int egral pronunc iat um. It is a factor, not a slice. I have one last point whic h I want to make because it has, I think, been too lit t le discussed. A boy, wh o has learned to c ount and is now beginning arithmetic, is told that numbers divide up into odd numbers and even numbers. He asks whic h are whic h and is t old first. t hat 2, 4, 6, 8 and 10 are even numbers, while 1, 3, 5, 7, 9 are odd numbers; second, that the number of the lef t hand page of any book is an even number; t h i r d t hat any number is a n ev en number whic h is nex t door-neighbour to 1. 3, 5, 7 or 9, o r t o any number ending in one of these; f ourt h t hat any number wh i c h is 2 o r a mult iple of 2 is an 160 even number. Af t er his firs t lesson he can t ell us correctly whic h of the numbers under 11 are even and whic h are odd. After his second lesson he c an t ell wh i c h of t he numbers u p to, may be, 500 or 600 are even — when he has access to a book. After his t hird lesson he can t ell us, f or any number, whet her it is even or odd. After his f ourt h lesson he c an t ell us not only what numbers are even but also, so to speak, what makes t hem even. And n o w we ask, at whic h stage has he «got the concept of even number» ? For at each stage there is some task whic h he can perf orm, whic h he c ould not do before, and by the t hird stage he can ans wer correctly a l l questions of the f orm «Is a n even number ?), Yet we are inc lined t o say t hat so long as he has not yet realised t hat even numbers are div is ible by 2, he has not really got the concept of even number; or else that he has not yet got the whole of it. Hav ing been told what a prime number is, he might still seriously and met hodic ally search f or that logic al impossibility, an even prime number between 30 and 50. I suggest t hat the question H a s he really got t he concept o r has he got the whole of the concept so and so» is lik e the question «Has he really learned t he art, o r has he learned t he whole art of skating ?» DISCUSSION Prof. EBBI NGHAUS When I f irs t read y our paper i t t ook me s ome t ime u n t i l I had clearly understood what it really was you want ed t o make clear. Was it at bot t om a rev iv al of t he t heory c onv ent ionally imput ed t o Berkeley t hat the concept of a general concept has no meaning at all ? But t he paper s howed t hat y ou did not wis h t o agree wi t h Berkeley — nor did you repeat the well-k nown instances of Berkeley by whic h he seems to prove t hat the idea of an abstract idea would be a contradictory one. 'What y ou really said i n y our paper was restricted t o the negation of concepts as isolated ment al occurrences, whic h people could remember as f ormerly hav ing experienced. You deny, i n ot her words, t he pos s ibilit y t o dismiss a l l ot her stuff f rom o u r mi n d and then jus t t o conceive the concept of say a square root of. In t his I ent irely agree wi t h y ou. But t he ques t ion wh i c h arises and wh i c h I want t o ask y ou as my f irs t one, is t his : wh o do y ou imagine are those people (I mean among philosophers) t o wh o m you 161 are so v igorous ly opposed ? There are indeed many authors o f oldfashioned textbooks of logic, wh o seem t o be quit e satisfied wi t h the independent existence o f concepts, f r om whic h ( i f they are decently put together) propositions arise — evidently by some sort of miracle. But ev en wh e n a n aut hor keeps u p t he t radit ional arrangement of elementary logic , beginning w i t h concepts a n d g o i n g f r o m t here through jugdment s t o syllogisms, he mus t not needs be unaware of the fact t hat t he logic al meaning of a concept is not hing else t han its possible f unc t ion as a predicate. That is t o say: red as a general concept does not mean any t hing f or itself but means t he being red of s omet hing — as we l l as t he general concept of ma n means t he being-a-man or rather (if you wi l l give me leave for such bad English) the man-being of something. We might even — and I t hink again wi t h general approv al — enlarge y our thesis in drawing it f rom concepts to propositions. Nobody goes around dissmissing all else f rom his mind and amus ing hims elf by t hink ing «all men are mort al » o r .soine Brit is h are scholars». And even i f he be an acquaintance of Unc le John and Sarah, I wonder if he ev er s hould f i l l u p his mi n d only by t hink ing isolately: I f J ohn is the uncle of Sarah, then at least one of Sarah's parents was not an only child. But i f somebody tells him, t hat neit her of Sarah's parents has eit her brot her o r sister, h e w i l l probably as k his int erloc ut or, how t hen, f o r heaven's sake, c ould J ohn hav e bec ome h e r unc le ? And i n saying so, h e reveals t o us t hat n o w t he propos it ional i mplication we are speaking of mus t really have occurred t o him. Generally speaking: such general truths as well as general concepts never are present to the mind only f or themselves. They need in order to b e ev ok ed s ome mobilis at ion, a n d t heref ore t he unders t anding must be alarmed by some inc ident whic h gives it the signal t o work — just as a country's army must be alarmed by some signal — before it goes t o war. I f y ou mean o n l y t his — y ou wi l l scarcely escape general agreement. But I v ent ure to ask y ou — as my f irs t question: wh o m do y ou t hink t o s it i n f ront of y ou on the opposition bench ? 2. From this, I may come t o my second question: Wh y do y ou t hink to be i n disagreement wi t h Hume's t heory of what he calls abstract ideas ? This theory deny ing as f irmly as possible any actual presence of such ideas t o our mind, seems t o me as f or its negative part i n 162 entire agreement wi t h y our o wn sentiment. Fo r t he positive part it assumes a certain disposition o r readiness of our mind, ac quired by the customary use o f some name, t o survey and of those part ic ular ideas wh i c h are associated wi t h t hat name by it s f ormer use. This readiness is put int o operat ion every t ime we begin t o reason upon any of our ideas. For instance, we may be confronted by some reason or ot her wit h the question whet her the angles of a t riangle are equal or not. The wo r d t riangle according t o Hu me ma y happen t o bring before our ment al eye the part ic ular idea of an equilat eral one. This would seduce us t o the af f irmat ion t hat all triangles are equiangular. But n o w t he requirement of a decision, b y means of t he jus t mentioned readiness, immediat ely makes «c rowding upon us» ot her i n div idual triangles as a scalene or an isosceles. These mak e us aware that not a l l triangles are equiangular — i n t he same manner as we become conscious of the fact t hat not all men are whit e coloured nor all trees lose t heir leaves in the wint er. This seems t o me t he recollectable experience b y wh i c h Hu me replaces abstract ideas by indiv idual ones, whic h on t heir part as he lit erally says, «are not really and i n f ac t present t o t he mind, but only in power». I f therefore y ou imput e to his theory a suggestion of a part ic ular recollectable experience of actively hav ing in mi n d what is s ignif ied b y t he wo r d c urrent ly c omi ng o f f one's t ongue, y o u imput e t o h i m a f lat contradiction t o t he v ery presupposition of this same t heory — under t he c ondit ion howev er t hat y o u a r e really speaking o f words s ignif y ing more t han one part ic ular idea. B u t i f you are — how can you be entitled to such an imputation, when Hume on t he c ont rary teaches wit hout any possible doubt, t hat the general signification of the words is not present to the mind wit hin the scope of any idea whatsoever, but only as the minds own disposition t o reproduce indef init e sets o f part ic ular ideas c us t omarily associated t o these words ? This is t he second question I wis h t o ask you. 3. Now, when I questioned y our concept of Hume's linguis t ic theory, it is no wonder t hat T also s hould question t he import anc e of y our objection t o it . This objec t ion is based o n t he observation t hat we may be work ing f or some t ime wi t h t he concept of prime number although the phrase prime number comes of f our lips, i f at all, only 163 once or twice during that time. But why should it not ? Hume does not bid y o u constantly mu r mu r p r i me number, p r i me number, p r i me number when y ou are researching f or one of t hem among a giv en series of numbers. Wi t h h i m t he word has sufficiently done its duty, if it has helped you to convey to y our mind the idea of what you are asked to do. The words by whic h the task is explained to you certainly vanish one af t er the ot her by being spoken. But does t hat mean the ideas, evoked by these words wit hin y our mi n d have the same scale of v anishing f rom y our consciousness ? And i f not, h o w c ould Hume be ref ut ed b y y o u r observation t hat i n a hy pot het ic al propos it ion «though the concept if somehow governs the whole of the proposition, the word «if» is over and over done wit h by the t ime the second word in t he sentence is prod4ced ? Hume did not teach t hat an idea reproduced f r o m o u r memory b y s ome wo r d s hould be restricted i n it s mental activity by the t ime the word is sounding through the air. And if he did not, as he actually did not, wh y should y our observation be an import ant objection t o his improv ed edit ion of Locke's and Berkeley's linguis t ic suggestions ? This is my t hird question t o Prof. Ryle. 4. In t he second part of y our paper y ou are giv ing an illus t rat ion of the impos s ibilit y of isolating those elements of our ideas whic h may be c ommon t o t hem. You illus trate i t by an analogy. But I want t o ask you, and t his is my f ourt h question, i f this analogy is not more puzzling t han i t is enlight hening t he f ac ult y of t he mi n d of hav ing any consciousness of such c ommon features whatsoever ? Your starting point in exposing the analogy is the impossibility, of pronounc ing the consonant «t » independent ly f r o m s ome ot her s ound c omplement ing t he «t» t o a whole syllable. There is n o need o f «but» o r «top» as specimens o f s uc h syllables. O n l y b y s ay ing «t» w e p r o nounce a s y llable and not a s ingle consonant. But n o w I s hall as k you my question: Ho w s hould it be possible t o illus t rat e t he impos s ibilit y of is olat ing concepts by an inseparability, whic h precisely is not an inseparability wit h regard t o concepts but t o the single perceptions. For as y ou are well aware, t here is not t he slightest dif f ic ult y t o separate t he c oncept of the consonant «t» f rom the concept of the v owel «e». But the inseparability of concepts f rom what is t hought of as t heir c ommon basis nat urally mus t be conceivable wi t h regard t o the possibility of 164 having concepts a n d not , as y o u propose, o f hearing noises a n d sounds. A n d thus my question is this: What do y ou mean by saying the factual inseparability of a consonant f rom some v owel c ould have some analogy wi t h a link , b y whic h concepts may be « finterlockingo u n c t i o n ?a l l y 5. Finally I should lik e t o question y our explanation of really getting the concept or of getting the whole of the concept so and so. Here I feel s ome doubt, whet her y ou mean we nev er can get the whole of a concept or what we can. As f or empiric al concepts I am quite satisfied t hat we cannot. Wi t h t his restriction I accept y our parallel between getting concepts and learning t he art of skating. The concept of wat er t o us means no longer an element, as i t did wi t h Aristotle, and the concept of Gold has been very much changed by nuc lear physics. Heav en k nows , wh a t these t wo concepts ma y embrace, wh e n another set of hundred years wi l l have passed by. But being imbut ed by modem logic y ou lik e numbers better t han such unreliable things as wat er and gold. O n t his f ield howev er y our idea o f get t ing b y stages the whole of the concept f or instance of even number becomes again unint elligible t o me. Here t he completeness of t he concept is granted by the definition. But when I now t urn back to the preceding stages o f what y ou present as a n ac quirement of t he concept ev en number, I wonder what those stages possibly could mean wit h regard to this acquirement. The boy wh o k nows t hat 2, 4, 6, etc... are even numbers knows only that these numbers are called by that name. But has he f or t hat any concept of what t he being-an-ev en-number is ? And if he has not, in what sense could y ou say he has acquired what ever s mall piece of t hat concept ? I f on the contrary he once k nows being an even number is being the number t wo or a mult iple of it, he has got at the same t ime the complete concept of it wit hout any hope for a possible f urt her perfection of it. This may be a hint , t hat learning cannot be the ult imat e source of our faculty of hav ing concepts. But i f it is not — whic h t hen would it be ? This is my f if t h and last question. M. BARZI N Je v oudrais seulement f aire deux remarques: (1') Si une des thèses soutenues par M. Ryle est que «La propos it ion 165 est logiquement ant érieure aux termes o u not ions q u i l a c omposent», je voudrais signaler que la voie très originale par laquelle i l atteint cette conclusion converge avec des efforts philosophiques de nature t rès différente. Léon Brunschvicg, au début du XX' siècle, a fait de cette thèse, un des pivots de la philosophie. La logique moderne — c'est-à-dire la logique de Frege — a c onsidéré c omme premier étage du système, le calcul des propositions, le calc ul des prédicats — c'est-à-dire des notions — ne devant venir que plus t ard et en s'appuyant s ur les conclusions d u c alc ul des propositions. Enfin, les axiomatistes nous ont habitué à f onder les systèmes déductifs sur une série de postulats contenant des notions f ondamentales qui n'ont pas de déf init ion ex plic it e dans le système. I l a été facile d e constater que, pour ces notions, les ax iomes jouaient le rôle d'une déf init ion implic it e. Le sens des notions fondamentales est, en effet, précisé quand on en a donné un certain nombre d'emplois, qui sont les axiomes considérés comme des propositions vraies. Cet exemple perdra toute étrangeté, si o n réfléchit que c'est ainsi que nous avons appris l a s ignif ic at ion de l a plupart des mot s de notre langue mat ernelle. Nous les avons ent endu employ er dans une série de phrases, qui précisaient de mieux en mieux leur sens a mesure que l a série s'allongeait; (2') Cette dernière constatation m' amène à ma deuxième remarque. I l me semble que M. Ry le se mont re trop sévère pour nos définitions, parce qu'elles sont t oujours incomplètes et provisoires. Mais n'estce pas l a l a s it uat ion o ù nous s ommes vis-à-vis de nos propos itions scientifiques ? Je crois que n u l d'ent re nous ne les considère comme des vérités définitives — i l s'agit bien entendu non de propositions formelles mais de nos vérités expérimentales. Et pourtant, tout en les sachant provisoires, nous accordons à ces vérités, une haute v aleur. I l me parait que nos déf init ions mérit ent le même respect. Nous les remanions au cours des progrès du savoir. Nous les remanierons sans doute encore dans le futur. Mais telles qu'elles sont, elles méritent notre respect, et elles sont des instruments précieux. Prof. PASSMORE There is clearly such a thing as not having a concept at all. A native tribe mi g h t not hav e t he concept of number larger t han five. Th i s does not mean, simply, that they cannot define the expression: «num- 166 ber larger t han f i v e . N o t ribe c ould do this. I t means t hey cannot give such answers as »eight» to questions. When we say that someone has f u l l y grasped a concept, t his means t hat t hey c an ans wer t he questions we n o w learn about: we nev er k n o w what n e w questions might arise. Knowing a def init ion is not either sufficient nor necessary for understanding a concept: t he test whet her we grasp the def init ion is the same as t he question whet her we grasp the concepts the def init ion contains. So t he not ion o f grasping a concept is p r i o r t o t he notion of grasping a def init ion. J. HYPPOLI TE Il y a une différence ent re l'usage d'une not ion et l a pensée seconde s ur cet usage même. A première vue, cela me parait équivalent à la différence entre langage nat urel et réf lex ion. Professor L. j. RUSSELL I should lik e t o ask Professor Ry le what is attitude is t o the v iews of t he 19t h Cent ury Brit is h Idealists, wh o held t hat t he only really concrete existence was experience ( wh i c h inc luded not only c ognitive, but also conative and affective aspects) and who considered propositions, concepts and so on as only aspects wi t h i n experience, and as abstract when taken by themselves. The v iews of R. L. Nettleship, in his lectures on Logic (in his Philosopical Remains) are in this respect f ar more unc ompromis ing t han those of Bradley and Bosanquet, and seem to me not unlik e those of Professor Ryle. J.N. FI NDL A Y I wa n t at this point t o ut t er a c ri d u cœur. I s hould lik e t o ask Professor Ry le wh y he t hink s t hat his ent irely acceptable v iew t hat having a concept ent ails being able t o apply i t i n c ert ain wa y i n various classificatory and argument at iv e contexts s hould jus t if y t he patently false v iew that there is no such t hing as a part ic ular recollectable experience of hav ing a concept in mind, dwelling on it, soaking oneself i n it, realiz ing what it involves, prof oundly understanding it, etc... I t seems t o me t hat t here c ert ainly are such recollectable ex periences and as f ar we k now they are essential t o most sorts of pro- found thinking. There was a time in my life when I practised a sort 167 of religious meditation in whic h I dwelt a great deal on what it really means t o have this or t hat v irt ue or t o stand i n this or that relat ion to t he world, ot her people, God, etc... N o w these medit at ions c ertainly inv olv ed a lot of going bac k and f ort h among instances and illustrations and consequences, but they always also involved a perpetual ret urn to the central theme of this exercise and a simple brooding upon it. I t was a mos t definite, clockable, remark able experience. No w i t seems t o me p l a i n t hat s uc h a medit at ion a n d s uc h a brooding o n concepts s imply i s a n indispensable, int egral p a r t o f every sort of thorough-going thinking. A mat hemat ic ian must feel the primeness a n d t he f ac t oriz abilit y of number int ermit t ent ly , perhaps, but def init ely . I c ert ainly do f eel i t myself. I recognize mult iples of certain numbers as old friends recognizable by t heir savour whit e the recalcitrant individualists of genuine primes impresses one wit h equal strictness. A mat hemat ic ian i f he is more t han a mere manipulat or must c ert ainly savour concepts i n t his manner before he applies o r employs t hem, and he c ert ainly tests t heir applic at ion or elaboration by his subsequent meditative enjoy ment of the outcome. I do not my self k now how one c ould possibly proceed in mathematics or in anything else wit hout this constant recourse t o what I may c all such recollective synthesis. I am sure Professor Ryle has such experiences and cannot see why he should wis h to suppress or minimiz e the fact. I can only t hink he does so because he thinks that separate t hought - experiences wo u l d necessarily be at oms instead o f elements c ont aining wit hin themselves t he structure of t he whole t o whic h t hey belong. Prof. KL1BANSKY If we were to accept the views proposed by Prof. Ryle I should lik e to ask h i m what is exactly the status of the concept, i f it is t he out come of learning. M. PERELMAN La réponse à la question du professeur Klibansky me semble dev oir exiger non pas une analogie, mais l'indic at ion de cas, aussi différents que possible, où l'usage du concept «concept» est légit ime et ceux où i l ne l'est pas. 168
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