OF THE HUMAN BODY. 29 



^ XI. This worm usually occupies the small 

 intestines ; some few are occasionally found in the 

 stomach. Most frequently the head is turned up- 

 ward, while the posterior part of the body and tail 

 extend along the interior portion of the intestiiial 

 tube. It is said that the head is insinuated in a sur- 

 prising manner, into the mucous membrane of the 

 intestines, and that the worm remains firmly attach- 

 ed to them. 



Dr. Tijson relates his having seen a living tae- 

 nia in an opened dog, who^e tail was pendent from 

 the rectum, while the head of the worm was so 

 deeply fixed in the small intestines, that he could 

 scarcely detach it with his nail. (43) We should 

 hence conclude v/ith Moseiitifiii and all practition- 

 ers, that no one can be freed from the taenia till 

 its head is evacuated. 



§ XII. The motion of this worm is singular 

 and spiral. The posterior articulations are separat- 

 ed from the anterior, they stretch out and contract 

 by turns, in such a manner that the worm becomes 

 sometimes narrow and sometimes broad : in a word, 

 in its movement it rolls as by undulation, and from 

 this cause it at times appears longer than it really 

 is. 



This worm sometimes passes out from the rec- 

 tum without producing any sensation ; more com- 

 monly, the head being attached to the mucous mem- 

 brane of the intestines, the motions of the body in 

 different directions excite those peculiar morbid 

 phenomena which shall be pointed out in the third 



