ON GENERATION. 185 



not appear fo early as in the other infufions, and 

 their appearance was later in the infulion of pep- 

 per that was not boiled. I then began to fufped. 

 that what is called fermentation, might be ow- 

 ing to the motion of thefe organic particles in 

 animal and vegetable fubftances. To difcover 

 if there was any fimilarity between this fpecies 

 of fermentation, and that excited by mineral fub- 

 ftances, I applied to the microfcope a little lime- 

 ftone powder, and poured upon it a drop of 

 aquafortis. But the phaenomena were totally 

 different. Large bubbles rofe to the furface, and 

 inftantly darkened the lens of the microfcope ; 

 when the grofs parts were diflblved, every thing 

 remained at reft, and nothing appeared which 

 had the fmalleft analogy to what we perceive in 

 the infufions of animal or vegetable fubftances. 



E X P E R. XLV. 



I examined the fcminal liquor in the milts of 

 different iiQics, extracted while the animals were 

 alive ; and I obierved a vaft quantity of obfcure 

 moving globules. I then iqueezcd with my 

 fingers the aperture in the bellies of fifhes through 

 which they emit this liquor ; and, in the drops 

 which I procured, I faw great multitudes of the 

 fame moving globules, which were almoft black, 

 and very fmall. 



E X r E R. 



