REPORTS OF CASES. 
265 
water. I can assure him that he can see such cases in which 500 
cattle and as many hogs are in the same field and that not an ox 
or steer will be sick although the hogs may be dying off at the rate 
of thirty or forty a day. He can also see hens, ducks, geese and 
turkeys eating the same food and picking over the recently fallen 
foeces from the diseased swine; he can see these fowl eating the 
bodies of deceased swine, but he would never see one die from the 
swine plague or hen cholera on that account. 
The above facts completely knock the bottom out of Hueppe’s 
“ gruene tiscli ” argumentation, and sufficiently emphasizes the 
point I have taken, viz.: that the identicity of all , apparently 
morpho-cultivation biological peculiarities in pathogenetic bacteria 
must be decided finally by one biologiccd quality , viz.—the patho¬ 
genetic. 
The same disease "must be produced with each and every 
attribute possessed by the natural diseases from which the germ 
in question has been procured. 
REPORTS OF CASES,. 
JOTTINGS FROM A CASE BOOK. 
By Wm. Frank Smith, M.R.C.Y.S. (Lond.) 
BLACK-LEG. 
Black-leg, quarter-ill, or black layer was for some considerable 
time confounded with pure anthrax, but recent investigation has 
demonstrated that though a similar affection it is essentially dis¬ 
tinct and one in which the blood contains its own individual 
organism or microbe. There is no more grievous disease affect¬ 
ing young live stock of the farm, or tiiat is at times so productive 
of loss to the cattle breeder. Locality to an extent seems to 
favor its development in having a marked influence on the quality 
of the food on which such stock is fed; season of the year like¬ 
wise, and other climatic conditions are important factors in its 
production: for instance, how often it is found that fall rains 
with warm days, causing a flush of luxuriant grass, or pastures 
which are two strong in the spring from a heavy autumn manuring, 
