why pasteur’s vaccine fails to prevent hog cholera. 115 
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nnection with this European disease of swine is somewhat pre- 
iture, and may turn out to be a glaring misapplication of the 
me. 
Dr. Liautard refers to the errors of Dr. Gerth because he feels 
;o be his duty to correct them, for otherwise they “might result in 
•ious injury to the interests of the swine-breeders of the country.” 
Le writer of this communication is quite inclined to look at what 
conceives to be the errors of both of these gentlemen from very 
ich the same point of view that is adopted by the able editor of 
l|) Review ; and at all events he is certain that an account of his 
: Deriments with the Pasteur vaccine and his conclusions in re- 
IP 
{fd to it will be of interest and, he hopes, of some value to the 
: hers of the Gazette. 
In October last Dr. Liautard had the kindness to furnish the 
reau of Animal Industry with a tube of each kind of vaccine 
spared by M. Pasteur for swine disease. We suppose that this 
s from the same lot as that which was sent to Dr. Gerth, and it 
uld seem that the objection brought against Dr. Gerth’s ex- 
•iment in regard to the period which had elapsed between the 
jparation and use of the virus would not apply in our case, at 
st not with the same force. We received the first vaccine Oc- 
>er 16 and used it the same day; consequently if this had been 
spared about September 25 it would only be three weeks old at 
1 ot time. 
The first vaccine when it reached us still had considerable ac- 
ity. It killed two mice out of three that were inoculated with 
Four pigs were vaccinated ; two of these had five drops each 
1 the two others about thirty drops each. Strangely enough, 
) which had only received a dose of five drops died, while the 
ee others showed no signs of being affected by the virus. 
The second vaccine was received by us October 23, but as suffi- 
at time had not elapsed since the first vaccination the tube was 
)t in a cool place unopened until October 28, when the second 
:cination was made. 
I would explain here for the benefit of those who have not 
.owed Pasteur’s investigations that two vaccines are prepared 
[ both are used upon each animal. One of these is supposed 
