why pasteur’s vaccine fails to prevent hog cholera. 235 
—— ■ ‘ 
It will be noticed at a glance that there is a very great dif¬ 
ence in the results of feeding organs of hogs dead of hog 
blera and those dead of rouget , but placing the figures side by 
, e will make this difference more perceptible, as is seen below: 
BLE SHOWING DIFFERENCE IN RESULTS OBTAINED BY FEEDING 
ORGANS OF HOGS DEAD OF HOG CHOLERA AND ROUGET. 
——-- 
Rouget. 
Hog 
Cholera. 
;al number fed... 
45 
37 
rnber dead from feeding. 
10 
34 
■centage dead from feeding.. 
22 
92 
k and recovered. 
4 
0 
)rtest period between feeding and death. 
3 
6 
agest period between feeding and death. 
6 
32 
erage period between feeding and death. 
4 
15 
This table brings out a very striking difference in the sus- 
ptibility of hogs to these two diseases when the virus is admin- 
ered in this way. The proportion which died from hog cholera 
seen to be more than four times what it was in the rouget ex- 
riments; the shortest period between feeding and death was 
ly half with rouget what it was with hog cholera, and the 
lgest period was with hog cholera more than five times what it 
is with rouget , while the average period between feeding and 
ath was nearly four times as long with hog cholera as with 
uget. Considering the considerable number of cases with each 
;ease these differences are so remarkable as of themselves to 
ike us suspect that the diseases experimented with in the two 
ses are not identical. 
4th. Effects of the virus on pigeons and guinea pigs. —A 
3thod long used in experimental medicine to determine the na- 
re and identity of diseases is the inoculation of other species of 
imals than those which are spontaneously affected. Thus 
doing, Cornevin and Thomas, in their remarkable investiga- 
>ns which demonstrated that the two diseases called charbon 
m 
7er and symptomatic charbon were not essentially identical, as 
