On the Structure and Development of the Cysticercus cellulosae, as Found in the Pig, by George Rainey

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                                these quadrupeds; <u>Cysticercus fasciolaris<\u> has been pro=
duced in mice from the <u>Taenia crassicollis<\u> of the cat; 
<u>Cysticercus pisiformis<\u> has been generated in rabbits 
from embryos of the <u>Taenia serrata<\u> of the dog; and, 
not to mention other cases, pigs have become infested 
with the <u>Cysticercus cellulosae<\u> after receiving with their 
food ripe segments of the <u>Taenia solium<\u> <s>from<\s> of the 
human subject. Moreover Stein found in the alimentary 
canal of the larvae of <u>Tenebris molitor<\u> the usual 
six-hooked embryos of an undetermined species of 
taenia, and on the outer or peritoneal surface of the 
stomach of the same larvae, numerous encysted cysti=
cerci, on nearly all of which the six hooklets shed by 
the embryo could be perceived adhering to the cyst 
and thus clearly showing the connexion of the two. In 
like manner Meissner found cysts containing cysti=
cerci in the body of the slug, and although he did 
not discover taenia-embryos, he found what were 
<s>unequivocally<\s> unmistakeably their six hooklets 
attached to the body of the Cysticercus.
While, however, the proof of the derivation of the 
Cysticercus from a taenia-embryo thus seems com=
plete, the process of conversion of the one into the 
other has not hitherto been followed completely in its 
different steps. The observations of Leuckart on this 
head are perhaps most to our present purpose. He 
found that on giving the ova of <u>Taenia serrata<\u> to 
rabbits a numerous brood of <u>Cysticercus pisiformis<\u> 
appeared in the liver, which situation he conceives 
they might have reached by the route of the vena portae. 
At first they were very small white bodies having none 
of the marks of cysticerci; they afterwards enlarged, 
assumed an oblong shape and, piercing through the 
substance of the liver, escaped into the peritoneal cavity, 
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George Rainey
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On the Structure and Development of the Cysticercus cellulosae, as Found in the Pig, by George Rainey, 1857. From The Royal Society, PT/56/8



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