CORRESPONDENCE 
581 
unless they are previously protected by inoculation. The practice 
of iuoculation does not destroy the infection ; on the other hand 
it keeps it up, but it enables dairymen to keep their cows in in¬ 
fected stables without great loss, when without it more than half 
of the new cows brought into them would surely die.” 
CONTAGIOUS PLEURO-PNEUMONIA. 
Editor Yeterinary Review : 
I had occasion lately to write to Prof. James Law, upon a 
matter, when in reply, he refers to my report of the conference 
held at Brooklyn, respecting the remedies that were necessary to 
prevent the spread of contagious pleuro-pneumonia, and 1 consider 
it only justice to that gentleman to give you that portion of his 
letter touching upon the subject. 
Yours respectfully, 
W. H. Pendry, JD.V.S. 
Cornell University, Ithaca, N.Y., Feb. 13th, 1884. 
Dr. Pendry: 
Dear Sir :— 1 am happy to say that you were correct in rep¬ 
resenting me as opposed to inoculation in this disease, if we can 
convince State or Federal Government to adopt effective meas¬ 
ures for promptly stamping it out. 
A short report such as that given is necessarily very imper¬ 
fect and I could have wished you had grasped and presented some 
points more fully. 
By way of example I would mention one point: “ The disease 
bore a great resemblance in one respect to glanders in horses and 
to consumption in men and animals. Glanders and tuberculosis 
would not affect to the same extent as contagious pleuro-pneumo 
nia and the lung disease, but that made the lung disease all the 
more dangerous because it was very liable to appear in a form 
not readily recognized.” 
My object was to draw attention to the fact that in all three 
diseases alike there were latent, occult or unrecognized forms 
which served to perpetuate and propagate the contagion even 
