American Veterinary Review. 
JULY, 1900. 
All communications for publication or in reference thereto should be addressed to Prof. 
Roscoe R. Bell, Seventh Ave. & Union St., Borough of Brooklyn, New York City. 
EDITORIAL. 
EUROPEAN CHRONICLES. 
Tuberculosis—Incubative Stage—Age of Lesions.— 
There are two questions related to the disease of the day 
which deserve close attention and which have not received un¬ 
til now any scientific satisfaction. The former has, besides its 
importance from a scientific point of view, a great value in a 
sanitary and commercial aspect. The latter has not yet been 
determined experimentally, and consequently the appreciation 
of the character of the lesions has almost been entirely empirical, 
their age being more or less correctly estimated by their ex¬ 
tent. 
The question was presented a short time ago before the 
Societe Veterinaire Pratique in Paris and commanded sufficient 
attention to obtain the formation of a commission to carry on 
experiments to solve the problems as far as possible. As a 
member of the Societe, I had the honor to be appointed on the 
commission, and thus gained a most advantageous opportunity 
to obtain valuable information for the Review at first hand. 
The programme laid out for the experiments consists in the 
purchase of twelve cows, which will be divided into five lots and 
submitted to the following experimentation : After being all sub¬ 
mitted to careful tuberculin test, four will be infected by eat¬ 
ing food, solid or liquid, containing tuberculous matter; four 
will be contaminated by inhalation of tuberculous powders ; 
two will receive an injection of emulsion of tuberculous culture 
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