PROGRESS OP VETERINARY SCIENCE AND ART. 529 
“The most common tapeworm of the dog is the taenia 
cucumerina, with oval shaped segments ; it is only when it 
has access to the rabbit or hare as food, that it acquires the 
taenia serrata with angular segments, and accordingly this 
last more frequently affects hunting dogs. Von ISiebold 
ascertained that in other young dogs in the same circum- 
stances, but which had not received any cysticerci, no taenia 
serrata was found, and it was fair to conclude, therefore, that 
the embryos of the taeniae had, in the first set, proceeded 
from the cysticercus. 
“Second series . — The experiments were made by feeding 
young dogs with the cysticercus tenuicollis, which is common 
in domestic cattle, and of which the vesicle often attains a 
large size. Having found that the vesicle was invariably 
destroyed by digestion, Yon Siebold contented himself there- 
after with giving the heads only, or scolices, to the dogs, 
removing artificially the vesicle. Six young dogs were the 
subjects of this set of experiments, which was conducted in a 
manner similar to the first, the worms reached their full de- 
velopment in forty-eight days, and corresponded exactly with 
the taenia serrata. In a fox which was fed upon the same 
cysticerci no taeniae were found. 
“ Third series . — In this set of experiments, the cysticercus 
cellulosae, from the flesh of the hog, was employed. Four 
young dogs received, at different times, a number of these 
cysticerci along with their food ; and on being opened at 
different intervals afterwards, there were found in their 
intestine, in various stages of advancement, corresponding to 
the length of time that had elapsed, tapeworms which re- 
sembled exactly the taenia serrata. Von Siebold was struck 
with the close resemblance of this Taenia serrata of the dog to 
the common Taenia solium of man, and after an accurate com- 
parison of various examples of these entozoa, concludes that 
they are identical, and not to be specifically distinguished, or 
that at most they are varieties of the same species dependent 
only on the difference of their parasitic habitations. 
“ Fourth series . — This series of experiments was performed 
in the same manner as the last, but with the heads or scolices 
of the ccenurus cerebralis, the entozoa so well known in 
connection with the disease of sturdy and staggers, which it 
produces when infesting the brain of sheep and cattle. In 
order that the ccenurus might be procured alive, the dogs 
experimented on were carried to a part of the country where 
a number of sheep were affected with sturdy. In the intestine 
of five out of seven dogs fed with the coenurus, great numbers 
of taenia were found, at successive periods, in different degrees 
xxviii. 68 
