2to COMPARISON OF 



Sometimes all the moving bodies have tails, 

 crpecially in the femen of man, and of the dog ; 

 their motion is not then very rapid, and appears 

 to be j>erformed v^ith diffi<:ulty. If the liquor 

 be allowed to dry, the tails or threads are firft 

 deprived of motion; the anterior extremity con- 

 tinues to vibrate for fome time, and then all mo- 

 tion ceafes. Thefe bodies may be long preferved 

 in this ftate ; and, if a fmall drop of water be then 

 poured upon them, their figure changes ; they 

 fall dowm into feveral minute globules, which 

 appear to have a fmall degree of motion, fome- 

 times approaching each other, and fometimes 

 trembling, and turning round their centres. 



The moving bodies in the human femen, and 

 in thofe of the dog and bitch, referable each o- 

 ther fo ftrongl'y, that it is not eafy to diftinguifh 

 them,efpeciaHy when examined immediately af- 

 ter they are taken from the body of the animal. 

 Thofe of the rabbit appear to be fmaller and 

 more adtive. But thefe differences and refem- 

 blances proceed more from the different ftates 

 of the fluids during the time of examination, 

 than from the nature of the fluids themielves, 

 which ought indeed to be different in different 

 fpecies of animals: For example, in the human 

 fluid, I have remarked large filaments, as repre- 

 fented in pi. III. fig. 3. &c. and I have feen the 

 moving bodies feparate from ihefe filaments, 

 from which they appeared to derive their origin. 

 But I could perceive nothing of this kind in the 



femen 



