THE CLASSIFICATION OF BACTERIA 117 



Glucose bouillon. No gas. Litmus reduced. Indol slight. 



Pathogenesis. Subcutaneous and intraperitoneal injections into mice, white 



rats, and guinea pigs, negative. 

 Habitat. Isolated from manure and sewage. 



BACTERIACE^ 



Cells short or long, cylindrical, straight. Without a sheath surrounding the 

 chains of individuals ; motile or non-motile ; with or without flagella ; 

 endospores present or absent. No true branching. 



A. Flagella absent, endospores present or absent. 



Bacterium Ehrenberg, p. 117. 

 . Flagella present. 



1 . Flagella arising from any part of the body, peritrichic. 



Bacillus, Cohn, p. 199. 



2. Flagella attached to one or both poles. 



PSEUDOMONAS Migula, p. 306. 



BACTERIUM 1 Ehrenberg 



Char, emend, by Migula. 



Cells cylindrical, varying from short ovals to longer rods and filaments ; with- 

 out flagella ; endospores present or absent, or, at least in a large number 

 of the species, unknown. 



SYNOPSIS OF THE GENUS 



I. Without endospores, or at least their presence not reported. 

 A. Aerobic and facultative anaerobic. 



I. Without pigment on gelatin or agar. 



a. Grow only at the body temperature. Class I, p. 118. 



b. Grow at room temperatures, 2o-22 C. 

 * Gelatin not liquefied. 



f Decolorized by Gram's method. Class II, p. 121. 

 ft Stained by Gram's method. Class III, p. 148. 

 ** Gelatin liquefied. Class IV, p. 155. 



1 The writer has provisionally included in this genus all non-motile Bacteriaceae, 

 leaving it to future investigations to determine whether any of the forms which may 

 have been wrongly placed in this genus do or do not possess flagella; it being assumed 

 that a non-motile organism is devoid of flagella until the contrary is proven. 



