PHYSIOLOGICAL PATHOLOGY. 
129 
paralysis thirteen days after trephining, recovered completely 
during the succeeding days. In forty-three days the paralysis re¬ 
appeared, and death by rabies occurred on the forty-sixth day. 
7th. These facts, however, are of very rare occurrence both 
in the rabbit and the dog. But we have found them taking place 
much more frequently in fowls, while either the death of the an¬ 
imals, of course, anticipated any possible return of the disease, or 
it failed to take place at all, as we have previously reported in 
respect to a dog, whose case was described in a former communi¬ 
cation. 
I may here remark that the hen, when affected with rabies, 
never shows very violent symptoms. The manifestations are 
merely dulluess, anorexia, posterior paralysis, and often great an¬ 
aemia, characterized by the pale coloration of the comb. 
8th. We have watched very carefully for any facts which 
might be of value in confirming certain assertions recently made 
referring to a presumed attenuation of the rabid virus by the ac¬ 
tion of cold, as well as the pretended passage of rabies from the 
mother to the foetus, and although our observations on those two 
points have been much more numerous than those which have 
been relied upon to advance these theories, we have, so far, ob¬ 
tained none but entirely negative results. 
9th. The certainty of the results of the inoculation of rabies 
by intravenous injection, sufficiently proves that the hypothesis of 
the passage of the virus from the periphery to the nervous cen¬ 
ters through the nerves, cannot be accepted as describing the only 
method of propagation of the virus, and that, in at least a ma¬ 
jority of cases, the absorption of the virus takes place through the 
circulatory system. 
In any case, however, the theory is open to objection. For 
example: to inject the rabid virus into a vein, a traumatism is 
necessary; the skin must be divided and the vein exposed. May 
it not, then, be supposed that the virus introduced into the circu¬ 
latory system, and returning to the wound, must come in contact 
there with nerves or open lymphatic vessels ? The following ex¬ 
periment removes this objection at once. We have at various 
times inoculated the rabid virus into a vein of the ear, and then 
