BIBLIOGRAPHY. 
847 
cHid serum injections in connection with Texas fever investiga¬ 
tions.” & 
After this I find from Dr. Salmon, occupying - nearly 50 
pages, a masterpiece entitled, “Some Examples of the Devel¬ 
opment of Knowledge Concerning Animal Diseases.” Intro¬ 
ducing the subject by remarks upon the progress made during 
the closing century in the domain of animal diseases, and mak- 
ing a clean distinction of the means of study and observation 
which had been used during the 18th, and up to the beginning 
of the 19th century, the author is brought to the consideration 
and comparison of the effectiveness of observation with and 
without experimentation. First, it is the efforts made to dis¬ 
cover the circulation of the blood by observation as done pre¬ 
vious to Harvey, and then the experiments which this great 
physiologist undertook, and which allowed him to explain and 
to prove how this important function was performed. 
.From this one may gather what the balance of Salmon’s 
article is going to be : A plea for experimental studies in their 
application to contagious diseases. Glanders and farcy open 
the march, and, after considering the long-lasting difference of 
opinion among the highest authorities in veterinary medicine, 
relating to the contagion or non-contagion of those diseases, 
how the question was settled by experiments. Variola is then 
considered, with the discovery of Jenner, which gives mankind 
a preventive of small-pox. Small-pox, cow-pox, and horse-pox 
then gave rise to series of experiments to the effect of estab¬ 
lishing their relation. Pleuro-pneumonia, anthrax, blackleg, 
Texas fever, rabies, and others since have all given to scientists 
opportunities for investigations by experiments, and it is by 
those that the cause, nature a.nd prophylaxy are known to-day 
in a manner which observation alone could never have given. 
Although Dr. Salmon s article refers only to those few con¬ 
tagious diseases his reasoning applies to all, and is one of the 
strongest arguments in favor of experimental research that I 
have read since the day of Bouley’s work, “ Le Progres en 
Medecine par PExperimentation,” published in 1882. 
After this article there are several communications of inter¬ 
est, among which stand those of Dr. E. A. de Schweinitz, on 
culture media for biochemic investigations, on examination of 
milk ; of Dr. V. A. Norgaard on the seventh international vet¬ 
erinary congress, and on the nature, cause, and economic im¬ 
portance of ovine caseous lymph adenitis; of Dr. Ch. W. Stiles 
and Dr. A. Hassall on parasites ; a short article on three trema- 
