OF THE HUMAN BODY. £1 



iiioreover authorize the method I have adopted to 

 separate them from other worms, and to form them 

 into one particular class which comprehends ; 



1. Taenia, 



2. Vermis Vesicularis. 



3. Tricocephalus. 



4. The tlscaris Vermicularis, 



5. TJie Lumbrico'ides, 



§> III. Our worms, like other animals, have 

 red hlood, which, according to the observations of 

 Midlerj{^>) circulates in an artery, and a whitish se- 

 rum flowing in a vein. Their external texture is 

 admirably organized. (7) The construction of the in- 

 terior organs is surprising to human imagination. (8) 

 It is proper to remark in this place, that we 

 should not trust to an examination of these worms 

 when dead, stiflT from cold, and hardened by the 

 spirit of wine, or injured by hot water, if we would 

 ascertain the singularity of their internal or exter- 

 nal structure : under these circumstances the parts 

 of the worm are changed, irregularly contracted, 

 and of a size larger than natural. Immersed in te- 

 pid water, they are better preserved, altered less, 

 and are more conveniently submitted to observa- 

 tion. 



FIRST GENUS. 



TAENIA.(9) 



^ IV. This is a very long worm which seem«^ 

 to be formed by a chain of flat articulations, unit- 

 ed together by means of a l^order or edi:;e, varyinii; 



