284 
GL W. BUTLER. 
worms became at least an inch and a quarter long, and resem¬ 
bled in many respects the smaller white worms found in the 
intestines. The worms that were one and two inches long 
when taken from the intestines, grew to two and three inches 
long in water in which was mixed some of the manure. 
While I did not succeed in growing a white worm of three 
inches in length from a red one of a quarter of an inch in 
length, I did, as above indicated, succeed in growing each 
specimen procured in such a manner as to lead me to think 
that probably the long white worm was only an advanced 
stage of the small red worm. 
In the mucous membrane were numerous small abscesses, 
varying in size from a small pin head to half the size of a pea. 
In each of these was a well developed small red worm. Where 
these abscesses had appeared close together, they frequently 
coalesced, and in this which constituted the larger abscess 
there were generally found two or three somewhat larger 
pale red worms. Some of these large abscesses, however, 
only contained one worm, but in these cases it was generally 
from three-fourths to an inch in length and nearly white. I 
inferred from the above facts that the parasite escaped from 
the mucous membrane into the intestine only when it had 
produced this abscess and it had ruptured. 
I made sections of several specimens, but in even the most 
minute specks which appeared on the surface of the mucous 
membrane I was able to find a completely formed worm, 
many of which were not more than one-twelfth of an inch in 
length. In no case was I able to find what might be con¬ 
strued into representing the ova of the parasite or the para¬ 
site in its embryo stage. I was not able to find the parasite 
in any other part of the horse than the intestines, and por¬ 
tions of the large colon when fed to a kitten and two pups, 
failed to produce the parasites in these animals, although they 
swallowed hundreds of them. The parasites always lost their 
bright red color when left to grow in water, and no degree 
of cold seemed sufficient to check their growth if they were 
kept in a temperature of not less than sixty degrees after be¬ 
ing thawed out. I enclose a pencil drawing of a parasite as 
