404 
M. L. TRA8BOT. 
are necessary to establish the certainty of the propagation of the 
disease at a short distance. At what distance and how Ions is 
the disease transmissable ? These questions remain without solu¬ 
tion so far. 
To terminate what is to be said relating to the transmissability 
of the disease, I may in a few words say something of the other 
zoological species to which it has been communicated. 
It is inoculable to man, and, since Jenner’s discovery, it 
takes witli him for some time, as for ever, the place of its 
variola proper, whether the virus is taken directly from the 
horse or if it is first given to the cow, where it becomes vaccine. 
It is inoculable to the pig, and acts with it as in the two 
preceding species. This is the result of numerous experiences, 
of which I shall say more hereafter. 
Tt may even be inoculated to the dog. 
Upon other species than the horse pustules appear only at the 
points of inoculation, though in man a few rare exceptions are 
reported. Prof. Parrot has exhibited at the Society of Biology a 
child on whose arm five or six very small secondary pustules 
were seen immediately alongside the sides of the larger inoc¬ 
ulated ones. He thought they might be the result of an 
auto-inoculation by the running of the vaccinal serosity upon 
the skin. However, this has no resemblance to the general¬ 
ized eruption of the horse. 
Generally the inoculation succeeds but once upon the same 
individual, or, at least, the reproduction takes place only after 
a long time. 
I limit these remarks for the time being only. 
Personally I vaccinated myself seven or eight times, always 
with negative results. It is probably so in the majority of cases. 
I never had a second attack among the cows that I inoculated 
one,'two or three years before. 
(To be continued .) 
