70 
G. P. Xo. 4544. Fed 4 gm. dried horse meat daily from March 15 to 29. Injected April 5 
with 6 c. c. antitoxic horse serum (Xatl. VIII, 18), 21 days after first and 7 days after 
last feeding. Symptoms; recovered. 
G. P. Xo. 4543. Fed 4 gm. dried horse meat daily from March 15 to April 6. Injected 
April 6 with 6 c. c. antitoxic horse serum (Xatl. VIII, 18), 21 days after first and 0 day 
after last feeding. Xo symptoms. 
G. P. Xo. 4563. 
G. P. Xo. 4371. 
G. P. Xo. 270. 
G. P. Xo. 4549. 
G. P. Xo. 4538. 
Do. Symptoms?; recovered. 
Do. Xo symptoms. 
Do. Symptoms; recovered. 
Do. Xo symptoms. 
Fed 4 gm. dried horse meat daily from March 15 to 31. Injected April 6 
with 6 c. c. antitoxic horse serum (Xatl. VIII, 18), 21 days after first and 6 days after last 
feeding. Symptoms; recovered. 
G. P. Xo. 174. Do. Dead in 20 minutes. 
G. P. Xo. 275. Fed 4 gm. dried horse meat daily from March 15 to April 9. Injected 
April 9 into peritoneal cavity with 6 c. c. antitoxic horse serum (Xatl. VIII, 18), 25 days 
after first and 0 days after last feeding. Xo symptoms. 
G. P. Xo. 4557. 
Do. 
G. P. Xo. 4574. 
Do. 
Symptoms?; recovered. 
G. P. Xo. 4569. 
Do. 
Xo symptoms. 
G. P. Xo. 4566. 
Do. 
Symptoms; recovered. 
It is perfectly plain from the above that guinea pigs may be sensi- 
tized by feeding them horse meat as well as horse serum. 
MAY GUINEA PIGS BE SENSITIZED BY FEEDING BEEF? 
Another series of experiments was then conducted by feeding 
guinea pigs with beef. The meat was dried, ground, and mixed in 
definite weighed amounts with ground carrots. 
G. P. Xo. 247. Fed 4 gm. dried beef daily from March 15 to 28. Injected March 28 into 
peritoneal cavity with 5 c. c. antitoxic horse serum (Xatl. VIII, 18), 13 days after first and 
0 day after last feeding. Symptoms ?; recovered. 
G. P. Xo. 269. Fed 4 gm. dried beef daily from March 15 to 29. Injected April 5 into 
peritoneal cavity with 6 c. c. antitoxic horse serum (Xatl. VIII, 18), 21 days after first and 
7 days after last feeding. Symptoms?; recovered. 
G. P. Xo. 171. Fed 4 gm. dried beef daily from March 15 to April 6. Injected April 6 
into peritoneal cavity with 6 c. c. antitoxic horse serum (Xatl. VIII, 18), 21 days after 
first and 0 day after last feeding. Xo symptoms. 
Five guinea pigs were placed in this series, but two of them died, 
apparently as a result of the diet. 
T Ye conclude, as a result of these feeding experiments, that guinea 
pigs may be highly sensitized to the toxic action of horse serum by 
previous feeding with horse serum or horseflesh. So far as conclu- 
sions may be drawn from the few experiments done upon feeding 
guinea pigs with beef, we feel justified tn stating that guinea pigs 
may also be rendered slightly ^susceptible in this way. "Whether 
pigs fed with beef would be more susceptible subsequently to the 
