630 
D. E. SALMON. 
grows better without oxygen than the swine plague, and in 
general the former has a greater growth energy. Agar tubes 
colored with lacmoid and sulph-indigotate of soda were dis¬ 
colored by the hog cholera germ, while those with litmus re-i 
mained unchanged ; with the swine plague the litmus and in¬ 
digo tubes were unchanged, but the lacmoid was slightly dis- 1 
colored. The swine plague germs produce phenol and indol 
during their growth, the hog cholera neither of these bodies; ! 
while the size is variable the latter in general produces coarser 
forms. 
Guinea pigs have a certain power of resistance to the 
swine plague, but are exceedingly susceptible to the hog 
cholera ; the reverse is true concerning the susceptibility of 
pigeons. In all susceptible animals death occurs from two to 
three days sooner after inoculation with swine plague than 
with hog cholera. The local reaction is as insignificant and 
trifling for the hog cholera germ as it is remarkable and severe 
for the swine plague. The hog cholera produces multiple 
coagulation necrosis in the acini of the liver, while when in¬ 
oculated with swine plague this organ tends to undergo fatty 
metamorphosis. Both agree in that they are found in the 
blood, that they are most numerous in the spleen, and next to 
this in the glandular, parenchymatous organs, as also in the 
muscles of the body. They differ in that the blood of the 
ventricles and auricles, as also that of the main blood vessels, 
is comparatively poor in hog cholera bacteria, while in acute 
cases of swine plague these localities are just as rich in bacteria 
as the above named organs. In hog cholera some of the cap. 
illaries are found fully plugged with rod-like bacteria, while 
in the regions lying between, no bacteria can be observed ; the 
swine plague bacteria on the contrary are evenly distributed 
in the capillaries, and are never so thick as to cause plugging. 
Finally, the swine plague germ is found in great numbers, 
almost in pure cultures, in the inflammatory oedema at the 
seat of inoculation, as also in the not infrequent exudates in the 
thoracic and abdominal cavities, while the hog cholera germ is 
so sparingly present at the seat of inoculation as well as in the 
small, hardly more than normal amount of fluid in these body 
