CLASSIFICATION BY GROUPS. Tir 
5. Do not generate gas in glucose bouil- 
lon. 
TYPHOID GROUP. 
B. typhosus type. 
2. Stain by Gram’s method. . 
B. MURIPESTIFER GROUP. 
B. muripestifer type. 
(4) Liquefy gelatin and generate gas in glu- 
cose bouillon. 
B. CLOACH GROUP. 
B. cloacee type. 
B. Gelatin colonies ameboid or irregular. 
(a) Do not liquefy gelatin. 
B. ZOPFI GROUP. 
B. zopfi type. 
(4) Liquefy gelatin. 
PROTEUS GROUP. 
B. vulgaris type. 
MICROSPIRA. 
I. Not phosphorescent. 
1. Do not liquefy gelatin, or only slightly. 
Msp. SAPROPHILES GROUP. 
Msp. saprophiles type. 
2. Liquefy gelatin. 
A. Produce indol. 
(a) Very pathogenic to pigeons. 
Msp. METSCHNIKOVI GROUP. 
Msp. metschnikovi type. 
