TRANSLATIONS FROM CONTINENTAL JOURNALS. 705 
variola. I am convinced that this opinion of M. Depaul, 
of somewhat too great a latitude as I think^ has been sug¬ 
gested to him by the exaggerations of Sacco, whom he 
has often quoted in his speech, by the surprising results 
announced by this prodigal inoeulator, who has not the least 
doubt of the preservative virtue of the variola of man against 
the sheep-pox, the virtue of the latter against the smallpox, 
the virtue of the vaeeine against the sheep-pox, and vice versa. 
Well! there are many errors in that which has been written 
by Sacco, even relative to the reciprocal preservative pro¬ 
perties of the virus of which I have spoken. Before then, 
experiments, judiciously made and severally followed up, 
which I need not mention, because you are no doubt acquainted 
with them all, demonstrated that there was nothing in the 
properties so inconsiderately claimed by Sacco, and that even 
the smallpox of man inoculated in the cow remained small¬ 
pox, and returned to man; that the vaeeine, in passing to 
man, remained vaeeine, and that there was nothing but the 
vaccine which preserved man, for a eertain time at least, 
from smallpox. All this would lead us to believe that man, 
and eaeh species of animal, has a peeuliar varioloid malady, 
whieh does not modify itself in its essenee, not even when 
engrafted from one species of animal on another. The case 
communicated by the commission of Toulouse, and observed 
by our learned colleague M. Lafosse, would tend to the con¬ 
trary of that which I have announced; and also, in aecordance 
with experiments carefully made and scrupulously noticed, 
would prove that there exists a varioloid whieh can be com¬ 
municated to the cow, and present itself in this animal in 
the exact form of the vaeeine; it would moreover tend to 
demonstrate that this varioloid has the preservative proper¬ 
ties of vaeeine; in a word, that it is the vaeeine. If it be 
true, as we admitted just now, that after a great number 
of observations, varioloid maladies never modify themselves 
in their passage from one species of animal to another, it 
would be the horse which would, with the cow, possess the 
fortunate privilege of furnishing virus exactly similar in 
respect to the vaeeine. 
[To he continued^ 
