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having been produced in enormous numbers within the cyst, 
they are destined to remain dormant until, by the death of the 
animal, opportunity for a far more distant migration is pro- 
vided, or whether, as is perhaps upon the whole least probable, 
from the collection already described, a true entozoon is 
evolved, must be determined by future research. 
Tenacity of life. — The little bodies in question are very 
tenacious of life, and they are not permeated by the carmine 
fluid till long after every mass of germinal matter (nucleus) of 
the muscles, vessels, and nerves, has been deeply coloured — a 
fact which shows that at any rate these bodies are quite distinct 
from the muscle-nuclei, and have not descended from them. 
After remaining for many hours in the carmine fluid they take 
the colour like every other kind of living matter, and several 
specimens exhibited one spot darker than other parts. 
Conclusion of previous observers. — Prof. Siebold states that 
these peculiar entozoon-like bodies were first discovered by 
Miescher in the muscles of a mouse in 1843. Hessling* found 
them in the muscular fibres of the heart of the sheep and ox. 
They have been also found in the deer. By Siebold and 
Bischoff they have been seen in the muscles of the mouse and 
rat. The latter observer found them in all the muscles of a rat in 
1845. In 1855 Baineyt found and figured similar bodies in the 
muscles of the pig, and inferred that they represented the early 
period of development of the cysticercus cellulosce of that 
animal, but later writers do not consider the evidence upon 
which this inference rests at all conclusive. J 
The form of the body, and the peculiar structure of the external 
investing membrane, would incline one to regard the bodies as 
some species of entozoon in an imperfect stage of development, 
but from the character of the contents it is possible that some 
zoologists might consider them more closely allied to the Grrega- 
rinae or Psorospermiae. There is I think no doubt that these 
bodies are of an animal nature. I am not aware of any 
gregariniform body exhibiting either the form, very con- 
siderable size, or general, characters of those in question. 
There is, I think, no character rendering it very probable 
that they belong to the vegetable kingdom. 
Of the probable manner in which these bodies reach the 
* Siebold and Kolliker’s Zeitschrift, Band y. p. 195. 
t “ On the Structure and Development of the Cysticercus Cellulosse, as 
found in the Muscles of the Pig,” by George Rainey, M.R.C.S.— Phil. 
Trans., vol. 147, p. Ill ; 1857. 
$ For a full account of the literature of the subject the reader is referred 
to a paper by Dr. Cobbold in the Lancet for January 27th, 1866, which is 
reprinted by Professor Gamgee in his work on the Cattle Plague. 
