DETERMINATION OF SPECIES. 99 
a. Yellow. 
A. Do nat liquefy gelatin. 
Sarcina lutea. 
Sarcina ventriculi. 
B. Liquefy gelatin. 
Sarcina liquefaciens. 
Sarcina aurantiaca. 
II. Family. Bacteriacez. 
1. Genus. Bacterium. 
I. Form spores. 
I. Spores polar. 
Bact. anthracis. 
Bact. anthracoides. 
Bact. subtile. 
2. Spores central. 
Bact. carotarum. 
Bact. angulans. 
3. Position of spores undetermined. 
A. Grow on gelatin at the room-temperature. 
(a) Colonies white. 
1. Do not liquefy gelatin. 
Bact. acidi lactici. 
Bact. coprogenes. 
2. Liquefy gelatin. 
(1) Center of colonies plainly floc- 
cose. 
Bact. vermiculare. 
(2) Colonies not floccose. 
Bact. tricomii. 
Bact. nephritidis. 
Bact. sempervivum. 
Bact. lacteum. 
