THE CLASSIFICATION OF BACTERIA 327 



B. Cultures show a greenish fluorescence. 



1 . Gelatin liquefied. 



42. Ps. viridescens (Ravenel). 



2. Gelatin not liquefied. 



43. Ps. ujtdulata (Ravenel). 



40. Ps. rosea (Bordas) 



B. roseus-vini Bordas-Joulin-Rackowski ; Compt. rend., CXXVI, i8g8, 1550. 



Morphology. Bacilli 0.8: 8-12 /*; filaments. A brush of polar flagella. Stain 

 by Gram's method. 



Gelatin colonies. Large, soft, white ; gelatin not liquefied. Reduce nitrates 

 to nitrites, 



Milk. Coagulated. Indol negative. Grows in media containing 0.3 per cent 

 tartaric acid. Acts feebly on glycerin and glucose, producing succinic 

 acid. No action on alcohol; Does not ferment saccharose. In solutions 

 containing glucose, a production of acetic and .butyric acids. In yeast- 

 water glucose solutions there is a rose coloration. 



Habitat. Cultures in wine become cloudy, lose color, and in 20 days there is a 

 sensible diminution of tartar and glucose, and a shght increase of acidity. 



41. Ps. Tromelschlagel (Ravenel) 



B. Tromelschlagel Ravenel : I.e. 



Morphology. Bacilli straight, 5-7 times their breadth ; occur singly and in 

 chains. Flagella at the poles. 



Gelatin colonies. Deep: round — irregular, yellowish, granular, entire. Sur- 

 face: colonies show a nucleus, with a yellowish granular and an outer 

 grayish granular, veined, irregular border. In 3 days i mm., white, 

 elevated, entire. Microscopically, dense, gray, irregular, with veined 

 margins. 



Gelatin stab. Surface growth thin, white, irregular ; in 2 weeks liquefaction 

 crateriform to a depth of 2 mm. 



Agar slant. Growth thin, translucent, grayish, becoming yellowish-gray, then 

 brownish. 



Potato. Growth thin, yellow, becoming brown, dry, with a metallic lustre. 



Bouillon. Slightly turbid, becoming clear. 



Litmus milk. Becomes darker, then is decolorized, alkaline, peptonized, 

 watery, translucent. 



Glucose bouillon. No gas. /«tsfo/ negative. Grow at 36°. 



Habitat. Soil. 



