If, SEMmAL VERMICULI, 3I_5 



with a confiderable quantity in a watch-glafs. 

 Wherever the microfcope penetrated, the motion 

 of vermiculi was feen. A third experiment has 

 demonftrated their prefence at a great depth. A 

 thin-fided chryftal tube, half a line in calibre, 

 and five inches in length, was filled with femen, 

 I held it perpendicular ; and, in this pofition, ap- 

 plied a magnifier to the fides, the great tranfpa- 

 fency of which permitted me to fee the included 

 femen clearly, when the tube v/as interpofed be- 

 tween the fun and my eye. Wherever the lens, 

 was applied, whether to the top, bottom, or mid- 

 dle of the tube, I always faw vermiculi. The 

 experiment was repeated with a tube of much 

 greater capacity ; it was a third of an inch in dia- 

 meter within, and at leaft four inches long, but thet 

 opacity of the fluid prevented me from feeing the 

 vermiculi it contained. However, the bottom, 

 being infecurely flopped, allowed fomxe drops to- 

 exude ; all were equally full of vermiculi as the 

 liquid in the higheV part of the tube. The con- 

 fequences were the fame on repeating the expe- 

 riment with the femen of the dog and other ani- 

 mals. 



In the fecond place, had the Swedifh naturalift.. 

 beflowed on feminal vermiculi the attention 

 they deferve, he muft have perceived they are 

 not inert corpufcules, but poffeffing a fpontane- 

 mis motion well chara£tevifed : that it is rep-ulat- 



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