364 
G, E. GRIFFIN. 
IMMUNITY AGAINST BLACK LEG. 
The principle by which this disease is prevented by inoc¬ 
ulation or vaccination is not more clearly understood than it 
is in other affections so prevented. The foreign experiments 
and studies, confirmed by ours, point to the fact that calves 
that contract the disease never again become seriously ill from 
it, and that those inoculated purposely likewise remain free 
from it thereafter. This may explain why, as Arloing has 
thought, the young stock particularly succumb from it, and 
adult cattle do not suffer ; it is probably because these did 
suffer from a mild attack when young and thereby they be¬ 
came proof. It has been pretty well established that old cat¬ 
tle in good condition, that have never grazed or been exposed 
outside where there is liability to receive the germs of black 
leg, can be inoculated almost as well as young cattle, because 
they never had become proof by a natural case, mild or seri¬ 
ous. On this proposition, we are still experimenting with a 
view to render the prevention of black leg as cheap as possi¬ 
ble. It is now practicable by any one. 
The intelligent farmer and stockman may apply it himself. 
SUPPURATIVE KERATITIS. 
By G. E. Gkifein, D.V.S., U. S. Army. 
It is simply astonishing the number of animals—horses 
especially—one observes suffering from this disease, and still 
more astonishing are the number of animals who lose the sight 
of one or both eyes from the neglect or maltreatment of these 
cases. 
It has always been the impression of the writer that ophthal¬ 
mology, so far as our domestic animals are concerned, has 
been very much neglected, with the results that very many— 
too many indeed—of our patients are condemned to long suf¬ 
fering and comparative uselessness. 
It is a well-known fact that in many of the veterinary 
schools the subject of ophthalmology does not receive the at¬ 
tention it deserves, thus leaving the student to hunt the sub- 
