793 
EDITORIAL. 
____:_ ? I 
the post-mortems, made at stated times, were witnessed by every 
member of the commission. Without going into the minute 
description of the entire proceedings—which may be later on 
presented in full in the Review—I will only for the present 
state the interesting and important conclusions that those ex¬ 
periments justify. 
(1) Ingestion is a mode of contamination far less efficacious . 
than inhalation ; in spite of an enormous mass of tuberculous 
matter taken by the animals per mouth, one stood the infection 
without harm ; three others were infected to a very slight degree, 
and in two others the lesions were so small that they would 
have escaped notice if the autopsy had been less minute. One 
calf born of one of those cows was fed from birth with tubercu¬ 
lous milk and became infected only to a very slight degree. 
The period of incubation with those animals has varied between 
32 and 48 days. 
(2) The respiratory apparatus is the most ordinary and 
most efficacious way for tuberculous infection. Whether the 
tuberculous substances were inhaled as dry impalpable dust or 
in fine sprays the results were about the same. The period of 
incubation varied between 19 and 32 days. Direct injection 
into the trachea has not given the results which might be ex¬ 
pected, as the lungs remained healthy and the manifestations of 
the infection remained localized at the point of the injection. 
In the animals whose air passages were infected by pulverization 
and sprays the thoracic organs were filled with tuberculous 
lesions. 
(3) If the mucous membrane of the trachea is resistant to 
microbian infection, it is not so with the mucous membrane of 
the mammary excretory ducts. By the experiments made in 
this series, it was shown that the udder is of all the tissues of 
the living organisms the best media of culture for the bacillus 
of tuberculosis. Incubation with these cows varied between 3 
and 13 days. 
(4) The intravenous injection showed itself the most severe 
and quickest mode of infection. No conclusion can be derived 
