INTESTINAL WORMS. 



121 



merit that the Cystoid worm, which lives as a parasite in 

 the livers of rats and mice (the Cysticercus fasciolaris), 

 was nothing but a stray Tcenia which had become vesicu- 

 lar, and which was in fact the Tape-worm of the Cat 

 (Taenia erassicollis). .... In the experiments made 

 at the Institute of the University of Breslau, these trans- 

 formations took place as soon as the liver of a mouse or 

 rat, previously ascertained to contain a Cysticercus fascio- 

 laris, had been devoured by a cat. In the stomach of the 

 cat, the livers of these rodents were digested, whilst the 

 worms contained in them remained unhurt ; this parasite 

 lost the caudal vesicle filled with fluid, and was then to 

 be seen without a tail in the chyme of the stomach and 

 small intestines of the cat, where, finding itself in a suit- 

 able place, it became developed in the articulated form of 

 a Tape-worm (Tcenia erassicollis) with adult sexual organs." 



More recently Dr Yon Siebold has obtained further re- 

 sults with Cysticercus pisiformis, which is frequently met 

 with in the coats of the intestines of the hare and rabbit. 



"These Cystoid worms, the size of which did not 

 exceed that of a pea, and which were still contained in 

 the cyst of the intestinal membrane, were introduced by 

 means of milk into the stomachs of some young dogs, to 

 the number of from thirty to sixty individuals to each> 

 These dogs were then killed by means of chloroform at 

 various intervals of time, and the contents of the sto- 

 mach and intestines carefully examined, when the worms 

 which had been swallowed as food were readily observed 

 in various states of development. 



" Two hours after they were swallowed, all the Cystoid 

 worms still remained in the stomach, but in most cases 



