66 FEEDING WITH CYSTICEECUS CELLULOSE. 



worms, from which we may venture to conclude that the stomach 

 of the fox had perfectly digested the Cysticerci with which he 

 was fed. 



I now took much pains to determine the species of these tape- 

 worms obtained from Cysticercus tenuicollis, and was astonished 

 to discover that they had all the characteristic features of 

 Ttenia serrata. The form of the eggs of the tape-worms obtained 

 from Cysticercus tenuicollis had first drawn my attention to the 

 Tcenia serrata, whose eggs, in form and in the number of their 

 investments, completely coincided with the eggs of the tape-worms 

 I had obtained. Comparing the head end of the latter with that 

 of the Taenia serrata, I could neither in the outline, nor in the 

 suckers, nor in the hooks of the double circlet, perceive any 

 difference between these Ttenice ; even the fully developed, as well 

 as the less developed joints of these tape- worms, with their trans- 

 verse wrinkles, reminding one of Ttenia serrata. 



In respect to the negative result of the seventh experiment, I 

 must leave the question open, whether it is not possible that the 

 intestine of the fox is unfit to afford a favorable nidus for the 

 development of the scolex of the Cysticercus tenuicollis. 



3. EXPERIMENTS OF FEEDING WITH CYSTICERCUS CELLULOSJE. 



The Cysticercus cellulose occurs, as is well known, in such 

 numbers in the flesh of our domestic pigs, that from a single 

 muscle of one of these animals hundreds of these cystic worms 

 may sometimes be collected ; and even in the flesh and intestines 

 of man, its occurrence is not an unusual phenomenon. For the 

 last reason I was exceedingly anxious to try the result of feeding 

 with Cysticercus celluloses, in order that I might discover from 

 which kind of tape-worm these Cysticerci are produced. 



First experiment. A young dog was fed, on the 22d May, with 

 forty-four Cysticerci ; on the 24th May, fourteen more were given 

 him, and on the following day, five-and-thirty. Before the worms 

 were given, they were taken out of their cysts. The dog was 

 killed on the 3d July, which was thirty-nine days after the last 

 feeding, and forty-two days after the first. Only four tape- worms 

 of two inches in length were found in this dog's small intestine. 

 From their appearance, they were evidently the product of the 

 Cysticerci which the dog had swallowed. 



Second experiment. Having procured two Cysticerci from a 



