NATURAL HIS-TORY. 151 justam magnitudinem non excrevissenL

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NATURAL HIS-TORY.
justam
magnitudinem
non
151
excrevissenL" *
Here then are animalcules of different sis,
some with tails and others without, which nwch
better agrees with my experiments, than with
Leeuwenhoek's own system.
in one particular;
We differ only
he says, that those wit1out
tails were young annalcula, which were not
arrived at their full growth;
while 1, on th
contrary, have seen these pretended animals
or threads, and
quit the filaments with tails
afterwards lose Iheiii by degrees.
In the same letter to Bocrhaave, 1
the semen of a ram,
says, in
he perceived animalcules
following each other in swarms like a flock of
" A. tribus circiter anilis testes arictis,
sheep.
adhuc calentes, ad ades meas dcfrri curave
fam, curs igitur materiarn ex cpididyiuibu
eductam, ope rnicroscopii contemptarer, non
sine ingeiiti voluptafe advertebarn animalcnla
omnia, quotquot innatabant semini mascuUno,
euiidem natando cursum teiicrc, ita nimirum
t quo it mere priora prinatarent codein
riora subsequerentur, adeo at hisce auiinalcuIi
OYCS factitare vide
quasi-,sit iugeuituin, quod
m.us, scilicet ut precedent iu in vest ig us grex
iuiversiis incedat."
This observation, which
Lceuwen hock
ee vol. IV. pages 280 and, 21.