A NEW PASTEURELLOSE. 
337 
and from the lung; hence the various manifestations of white 
scour, with their more or less rapid development. 
Finally, in the rare cases where the sick resists the intes¬ 
tinal infection recovers from white scour, the pulmonary infec¬ 
tion continues its slow progress and ends at last by the forma¬ 
tion of the massive lesions which characterize the ordinary form 
of lung disease. 
IV .—The iiature of this disease being well established, it 
remains to know how the infection takes place. 
The principal symptoms being the intestinal discharge, one 
is likely to believe that the specific microbe is introduced in 
the organism with the food of the new born calf. 
A much spread opinion is that the creation of numerous 
creameries in Ireland has contributed in great part to the propa¬ 
gation of the disease, because the milk given to the calves is 
deprived of one of its most important nutritive elements. 
This opinion does not stand. Indeed, for one point, the dis¬ 
ease existed in Ireland before the creation of the creameries. 
And, again, our inquiry has taught us that, in none of the 
infected farms, no uncreamed milk is given to calves imme 
diately after birth. They receive pure milk during a variable 
time : one month, fifteen days, eight days to the minimum ; but 
white scour appears always during the first days following birth, 
that is before the calf receives any uncreamed milk. 
Creameries have then nothing to do with the apparition of 
the disease. 
Yet, it is not unreasonable to think that pure milk given to 
new-born animals might serve as a^vehicle for the agent of infec¬ 
tion ; to this point of view I have studied : i. Milk just as it 
came out of the udder of a cow whose calf had just died with 
white scour. 2. Milk coming from an infected barn and 
gathered with special care. 
The bacteriological and experimental study that I made of 
these two samples gave negative results concerning the presence 
of pathogenous pasteurella. 
It is certain this study is insufficient to conclude that milk, 
