COMPARATIVE PATHOLOGY. 
63 
that has been offered by a class of men calling themselves veter¬ 
inarians, who have known even less than the owners of cattle or 
who have been influenced by cupidity and an utter disregard of 
the cattle interests both at home and abroad. 
What can we say of this class of men ? It can scarcely be 
possible that they do not know that the “ lung-plague ” is conta¬ 
gious. This fact is universally taught by every writer who is 
entitled to an opinion, and is abundantly proven in every out¬ 
break of this malady that has ever occurred on this continent. 
There seems to be but one inference, and dearly will it cost a 
country that listens to men who are so ignorant that they cannot 
learn, or so selfish that they will not. 
COMPARATIVE PATHOLOGY. 
UPON A PARASITIC TUBERCULOUS OF DOG, AND UPON THE PATHO¬ 
GENY OF THE TUBERCULOUS FOLLICLE. 
By M. Lanlaine.* 
I recently had occasion to observe in the lungs of a dog the 
alterations produced by the eggs of a nematode, the strongylus 
vasorum (Baillet), whose identity with that of tuberculosis seems 
to me very interesting. 
But before mentioning the facts which form the principal 
object of this note, I believe it is indispensable to resume, in a 
few words, the principal changes of migrations of the strongylus 
of blood vessels, such as they are known, or such as they can be 
supposed according to my observations. 
Strongyli of blood vessels live, in their adult state , in the 
right ventricle, and the great divisions of the pulmonary artery 
of the dog, where they collect in more or less voluminous masses, 
males and females mixed together. These masses undoubtedly 
give rise, at the point of the vessel where they are immobilized, 
to an endarteritis, whose vegetations assume the form of threads 
or lamellae anastomosed together, which support the parasitic 
ball and prevent its displacement by the current of the blood. 
*Note presented by M. Bouley at FAcademie des Sciences. 
