Chester's Synopsis of Groups of Bacteria 233 



A. Grow well on nutrient gelatin. Gelatin liquefied very slowly or merely 



softened. 



1. Stain by Gram's method. SWINE ERYSIPELAS GROUP. 



2. Not stained by Gram's method. GLANDERS GROUP. 



B. Little or no growth in ordinary nutrient gelatin. 



1. Grow well in nutrient bouillon at body temperatures. 



a. Stained by Gram's method. Rods cuneate clavate ir- 

 regularly swollen. DIPHTHERIA GROUP. 



2. No growth in nutrient bouillon or on ordinary culture-media. 



Rods slender, tubercle-like. 



a. Stain by Gram's method. LEPROSY GROUP. 



b. Do not stain by Gram's method. INFLUENZA GROUP. 



3. No growth in nutrient bouillon or on ordinary culture-media. 



Rods variable. ROOT-TUBERCLE GROUP. 



II. Not stained with aqueous solutions of basic anilin dyes; not easily decolorized 

 by acids. TUBERCLE GROUP. 



COCCACE.E 



Cells in their free condition globular, becoming slightly elongated before division. 

 Cell division in one, two, or three directions of space. 



A. Cells without flagella. 



1. Division in only one direction of space. Streptococcus (Billroth). 



2. Division in two directions of space. Micrococcus (Hallier). 



3. Division in three directions of space. Sarcina (Goodsir). 



B. Cells with flagella. 



1. Division in two directions of space. Planococcus (Migula). 



2. Division in three directions of space. Planosarcina (Migula). 



