INTESTINAL WOBMS. 
121 
ment that the Cystoid worm, which lives as a parasite in 
the livers of rats and mice (the Cysticercus fasciolaris), 
was nothing but a stray Taenia which had become vesicu- 
lar, and which was in fact the Tape-worm of the Cat 
(Taenia crassicollis) 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 ( Taenia crassicollis ) 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 
mean3 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 
