280 Account of a Filaria in a Horse's Eye. 
fusion of coagulable lymph, the result of inflammation of the 
vessels, caused by the presence of a foreign body. There is no 
doubt whatever that the discoloration exists in the aqueous hu- 
mor, and not in the cornea. A few weeks after the animal was 
first discovered, the conjunctiva was much injected; but since 
that time it has assumed its natural, healthy appearance, and now 
does not differ in the least from that of the other eye. There is 
nothing peculiar in the appearance of the horse, which is of the 
Eclipse family, and seven years old. Owing to the incessant and 
rapid motion of the worm, it is difficult to examine it with a mi- 
eroscope, so as to determine with accuracy, its precise internal 
organization, yet it evidently belongs to the class Entozoa, order 
Nematoidea, genus Filaria, species Papillosa. The only oth- 
er genus which it resembles, is the Gordius of Linneus; but 
as this belongs to the class Annelides, which have red blood, in- 
habit the water only, and are more filiform in shape, there is but 
little danger of confounding them together. 
We have stated that the E’ntozoa are so called because they 
inhabit the interior of other animals. Every kind of animal, in- 
deed, has been supposed to have its E’ntozoa, or internal parasites, 
which are peculiar to itself, just as it has its Ectozoa, or external 
ones. They not only infest the alimentary canal, and the ducts 
leading into it, but also the muscles, the cellular tissue, and the 
parenchymatous structure of the different organs, as the brain, 
liver, lungs, kidneys, &c. Indeed, it is now believed by many 
naturalists, that every different tissue and organ of the body has 
its peculiar parasite. ‘Thus in man, more than twenty different 
species of animals have been discovered in different parts of his 
body. In the brain, we find the Echinococus hominis ; in the 
liver, the Fasciola hepatica ; in the venous blood, the Linguatu- 
la venarum ; in the kidneys, the Strongylus gigas ; in the mus- 
cles, the Hi sidiblereris cellulosa ; in the cellular tissue, the Filaria 
medinensis, or Guinea worm ; in the female ovaries, the Lingua- 
tula pinguicola ; in the ideation: the Tenia solium, the Ascaris 
lumbricoides, &c. ; and some attack infants only, as the Oryurus 
eeeerolaris. 
~ Mr. Richard Owen, of England, has lately discovered that the 
human muscles of voluntary motion are sometimes the residence 
of. “very Minute cysts of an oblong figure, in size and color beat- 
ing a strong” resemblance to nits, or the young of pediculi. 
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