DETERMINATION OF SPECIES. 95 
toneal cavity of a white or ordinary ‘house mouse, 
using I per cent. of the body-weight of a forty-eight 
hour bouillon culture. If the mouse is killed, it is 
well to try the culture on guinea-pigs or rabbits. 
A careful autopsy should be made in all cases, cult- 
ures taken from the organs, and all pathogenic 
changes noted. 
Il. DETERMINATION OF THE NAME OF A SPECIES. 
When the points mentioned at the beginning of 
this chapter have been determined, the name of 
the species, if it has been described and named, 
can be found by referring to the bacterial analysis 
tables in Migula’s System der “Bakterien, Stern- 
berg’s Manual of Bacteriology, Fligge’s Dre 
Mikroorganismen, or Chester’s “Studies in Sys- 
tematic Bacteriology’’ in the ninth, tenth, and 
eleventh Reports of the Delaware College Agrt- 
cultural Experiment Station, 1897, 1898, and 1899. 
The following table, adapted from Migula, may 
assist in the determination of the name of a species : 
BACTERIA. ' 
I. Family. Coccaceze. 
1. Genus. Streptococcus. 
I. Grow on gelatin. 
1. Colonies white. 
A. Do not liquefy gelatin. 
(a2) No growth on the surface in gelatin 
stab cultures. 
S. pyogenes. 
S. equtti. 
S. cystitidis. 
