12 
D. E. SAXvMON 
their edges. It has no motion and is probably identical with the 
micrococcus described in my report for 1884, but which on ac¬ 
count of pressure of other work and lack of assistance was imper¬ 
fectly studied at that time. 
This germ is fatal when inoculated in mice, rabbits, guinea- 
pigs and pigs, and occasionally so when given to fowls and pigeons 
in large doses. 
n 
Let us now compare these two maladies more carefully in 
order to bring out the points of difference. 
Taking the germs first, we find that of hog cholera to be mo¬ 
tile, while that of swine-plague never presents any evidence of mo¬ 
tility. This difference is a very striking and radical one. The 
appearance after staining is almost equally marked, providing we 
examine stained coverglass preparations made from the organs of 
affected animals. In the one case we have a long oval element 
with a dark border and a pale center; in the other we have a 
short oval element, staining darkly at the extremities and with an 
unstained transverse band across the median portion. 
The hog cholera germ grows actively on the cut surface of 
potatoes, while the other microbe refuses to grow at all in that 
condition. 
The hog cholera germ resists drying for a long time and will 
grow after it has been kept dry for one or two months, but the 
swine-plague microbe dies in a ver} 7 few days (three or four) after 
being dried.. ' , i 
The faSSSi: ffTgT%ip>lies J t%]rinI dy gflwatei; ^Q^vemains alive for 
three or four months after being placed in it, while the latter does 
not multiply at all in such water and dies within two or three 
weeks. 
* * 
Mice are killed by the hog cholera germ in from eight to six¬ 
teen days, by the swine plague in from two to six days. 
Rabbits die from hog cholera inoculations in from six to nine 
days, but they only live from twenty hours to six days after inoc¬ 
ulation with swine plague. 
Fowls have resisted all our inoculations with the hog cholera 
microbes; the swine plague germ kills them when inoculated in 
large doses. 
