160 
POPULAR SCIENCE REVIEW. 
are introduced into tlie organism of the animal in the food or 
water, or even carried by the air is unknown. Nor have we 
yet been able to learn if these simple bodies are the larval or 
imperfect state of development of higher and more complex 
organisms. 
Conclusions. — The facts concerning these entozoa ( ? ) may 
be summed up as follows : — 
1. That in almost all, if not in all, animals dying of Cattle 
Plague, entozoon-like bodies exist in considerable number in 
the voluntary muscles of the system and in the heart. 
2. They are occasionally found, but in comparatively small 
numbers, in the muscles of the system of animals apparently 
in perfect health when killed. 
3. These or closely allied species have been known for more 
than twenty years, but their nature has not yet been deter- 
mined. They have been found in the ox, sheep, deer, pig, rat, 
mouse, and perhaps other animals. 
4. In the muscles of a calf killed by Cattle Plague, under six 
months of age, these bodies were found in immense numbers. 
5. They vary in length from less than the - ^V oth of an inch 
to at least a quarter of an inch in length. They are, for the 
most part, imbedded in the contractile material of the elemen- 
tary muscular fibre, but they are occasionally found free. 
6. They are for the most part spindle-shaped, and the ex- 
ternal investment or envelope exhibits a very delicate and 
peculiar structure, being completely covered with delicate hair- 
like processes. 
7. The mass within appears granular to low powers, and 
exhibits a division into numerous segments, but it is found to 
consist entirely of minute bodies resembling one another, pos- 
sessing very definite characters, less than -aoVo^ °f an inch in 
their longest diameter, and of peculiar form, being oval, flat- 
tened, the body slightly curved laterally, with one extremity 
blunt and the other almost pointed. 
8. The entire mass increases in size as these small bodies 
increase in number, probably by division and subdivision, 
within the cyst. 
