ioS Of the Semen Mafculinum, 
reafon it follows, that the animalcules may be difcovered 
sn the femen of the fmalleft birds, quadrupeds, and 
iifhes ; nay, and even in infers to. For Mr. Leeuwen¬ 
hoek affirms, that he found in the white matter he had 
fometimes fqueezed from the hinder parts of male A 
fpiders, a prodigious number of ani-rj,lcules. He found 
them alfo in the femen of the 0 dormoufe, in p oyfters, 
in * filkworms, in the r labella minima, or fmall dragon 
fly, the common * fly, in the male 1 flea, in u gnats, 
and many other infedls x . 
It is obfervable that amongft the many fpeeies of ani¬ 
malcules found in waters, and other infuflons, th$re are 
none like thofe in femine; but that thefe laft, in all forts 
Of creatures, have a general likenefs to each other, and 
appear in continual motion without any intermiffion, if 
the fluid be but fufficient for them to fwim in. 
It is farther obfervable, that no animalcules can be 
found in the blood, fpittle, urine, gall, chyle, or any 
other of the humours, except the femen only. 
* Phil. Tranf. No. 279. 0 Arc. Nat. Tom. i. Part ii. 
p. 27. p Ibid. Tom.ii. Parti, p. 144. 1 Ibid. Part ii. 
p.442. r Ibid. Tom. iv. p. 19. s Ibid. * Ibid. 
J>, 20. 8 Ibid. p. 22, * Ibid. p. 294. 
Of 
