68o 
Journal of Agricultural Research 
Vol. XXI, No. 9 
At autopsy, December 19, 1918, there were found 10 Gastrophilus spp. 
in the pylorus, about 75 Strongylus in the cecum and colon, and 1 Strong- 
ylus and 4 Setaria equina in the abdominal cavity. 
No. 501.—Aged, healthy mare. 
At autopsy, December 16, 1918, there was found a moderate infesta¬ 
tion of Strongylus and Cylicostomes in the cecum and colon. 
No. 8.—Aged, healthy gelding. 
At autopsy on May 26, 1918, there were found about 150 Gastrophilus 
spp. in the stomach and pylorus, a moderate infestation of Strongylus 
and Cylicostomes, and a small aneurism of the anterior mesenteric artery 
containing live embryos. 
No. 9.—Healthy 12-year-old mare. 
At autopsy on March 18, 1920, there were found about 150 Gastrophilus 
spp., a severe infestation with Strongylus and Cylicostomes, and a small 
worm-free aneurism of the anterior mesenteric artery. 
No. 570.—Five-year-old gelding in excellent condition. 
At autopsy, December 16, 1918, there were found 6 Gastrophilus spp. 
and a most severe infestation of Strongylus and Cylicostomes. The 
animal showed no symptoms of the infestation. About two months 
before autopsy he was corralled with wormy colts, and it seems likely 
that the infestation came at that time from them. 
No. 7.—Aged, healthy mare. 
At autopsy, December 20, 1918, there were found a few Gastrophilus 
spp., 2 Setaria in the abdominal cavity, small number of Strongylus and 
Cylicostomes in the cecum and colon, and a few Oxyuris in the rectum. 
No. 13.—Aged, healthy animal. 
At autopsy, April 5, 1919, there were found 150 Gastrophilus spp., 1 
Setaria, a few Strongylus and Cylicostomes in the cecum and colon, and 
a very large aneurism in the anterior mesenteric artery containing many 
live embryos. 
No. 633.—Young, healthy gelding. 
At autopsy, July 8, 1918, there were found a few Gastrophilus spp. and 
a moderate infestation of the cecum and colon with Strongylus and 
Cylicostomes. 
No. 1.—Aged, healthy mare. 
At autopsy, December 12, 1919, there was found a severe infestation 
of the cecum and colon with Strongylus and Cylicostomes. 
DISCUSSION 
The percentage of eosinophiles in the peripheral blood of healthy 
horses varies greatly even when the examinations are made at frequent 
intervals. In studying Table I, one can readily see that if certain indi¬ 
vidual examinations were picked out, exceedingly varying results might 
be obtained. This fact possibly accounts for many of the different 
