OF THE HUMAN BODY. 46 



figure of the small bladder is sometimes round, 

 sometimes oblong, sometimes angular, etc. 



Wliile the worm is living, by slightly com- 

 pressing the end of its long neck, the head seems 

 to be furnished with fangs, and a little mouth like 

 that of the armed taeniae. 



^ XXV. Among authors we find our vesicular, 

 worm confusedly described under various names. 

 It was called ILjdatis animata by Peyerf(i25) Ova 

 in poinds by Bartholin, (i^Q) Lumhrims Jiydropi- 

 ciis by Tifson,[i"Z7) Hydra hydatula by Lin- 

 iiaeus,(i28) Taenia hydato'ide hy Pallas,{i2^) Tae- 

 nia vpsicularis by Goeze,{iZO) Taenia hidatigena 

 by FiscJieriiSi) and by Werner,{iS2) I have 

 called it vesicular won:;, because this name seems 

 to me most appropriate and convenient. (133) 



§ XXVI. This worm has been several times 

 found, not only in the brain, but also in various 

 other parts of our body, by a number of illustrious 

 physicians. (134) According to the observations of 

 Koelpin{lS5) and of Walther,{V3Q) the greater 

 part of hydatids may be reduced to real vesicular 

 worms. (137) Pallas is induced to believe that en- 

 cysted dropsy may be produced by a cluster of ve- 

 sicular worms. (138) 



§ XXVII. It seems probable from observations 

 already made, that this worm commonly resides 

 in those parts of the body which abound in lymphat- 

 ic vessels ; its bead is attached to their branches, 

 absorbs the lymph they contain, and thus fills the 

 small bladder that constitutes its body. Its eleva- 



