THE CLASSIFICATION OF BACTERIA 147 



■Gelatin colonies. In 3-4 days. Deep : very small, white, entire. Surface : 

 thin, moist, glistening, stringy, becoming thicker. 



ji£:ar colonies. In 2 days, at 30° C. Deep: small, yellowish white, entire. 

 Surface: moist, glistening, dirty white, stringy, becoming white and 

 spreading. 



Agar slant. Growth limited, raised in the centre ; whitish — grayish. 



Gelatin slant. Growth milky, raised in the middle. 



Gelatin stab. In depth, growth pearly ; on the surface, growth spreading, milk- 

 white. 



Nitrate bouillon. Weakly turbid, with a pellicle, becoming clear with a 

 stringy sediment ; denitrification. 



Habitat. As a contamination of an old culture of B. Stutzeri. 



68. Bact. punctatum 



Bacillus No, ig Adametz : Landwirthsch. Jahrbucher, 1889. 



Morphology. Bacilli 0.8 : 2.0-3.0 jn, and filaments. 



Gelatin colonies. In 4-6 days, compact, scarcely visible points ; opaque to 



dark brown, not spreading. 

 Gelatin stab. Slight growth. 

 Milk. Rendered acid. 

 Habitat. Milk. 



69. Bact. Middletownii 



No. S3 Conn ; I.e., 1894, 82. 



Morphology. Bacilli short. Grow at 35° C. 



Gelatin colonies. As raised beads, i mm. 



Gelatin stab. On the surface, slightly spreading, pearly white, waxy ; gas in 



the gelatin. 

 Agar slant. Growth white, elevated. 

 Potato. Growth whitish — brownish. 

 Milk. Acid, not peptonized. 

 Bouillon. Slightly turbid, with a sediment. 

 Habitat. Milk. 



70. Bact. coccoideum 



No. lb Conn : I.e., 1893, 51. 



Morphology. Ovals — coccoid forms. Grow at 35° C. 



Gelatin colonies. A white bead, becoming thin, spreading; sometimes a 



raised central nucleus. 

 Gelatin stab. Growth nail-shaped ; gas in gelatin frequently. 



