70 BACTERIOLOGY 



Gelatin stab. On the surface growth, thin, colorless, becoming in 3-4 days 



sulphur-yellow. 



Pigment. Soluble in alcohol. Old gelatin cultures give off a peculiar odor. 

 Potato. Growth scarcely visible before the fifth day. 

 Habitat. Isolated from urine of man. 



33. Str. fluorescens (Klamann) 



Diplococcus fluorescens-fcetidus Klamann: Allgemeine medizin Centralzeitung, 1887, 1347, 



Morphology. Cocci 1.4 /A; diplococci, chains of 6-10. Grow at 37 C. 

 Gelatin colonies. Surface colonies round, gray brownish, becoming a crateri- 



form liquefaction, with a brownish gray sediment. The surrounding 



gelatin becomes grassy green violet. 

 Gelatin stab. On the surface a round, shallow, crateriform liquefaction, with a 



glistening iridescent film, and a greenish gray sediment. Film on surface 



violet ; later a saccate liquefaction of the gelatin. 

 Agar slant. A granular brownish gray growth. 



Potato. A greenish growth, becoming bluish green. Potato colored blue. 

 Habitat. Isolated from posterior nares of man. 



34. Str. violaceus (Schroter) Trevisan 



Bacteridium violaceum Schroter: Cohn Beitrage Biol., 1870, 122. 

 Micrococcus violaceus Cohn : Beitrage, 1870, 157. 

 Streptococcus violaceus Trevisan : Gen., 1889, 3 1 - 



Morphology. Cocci elliptical, larger than B. prodigiosus ; in chains. 

 Gelatin colonies. Slimy, raised, violet. 



Potato. Slimy spots, deep violet, becoming coalescent, spreading violet. 

 Habitat. Water. 



SPECIES WITH A THICK GELATINOUS ENVELOPE 

 35. Str. involutus Kurth 



Mitteilungen a. d. Kaiserl. Gesundheitsamte, 1893, 439. 

 Streptococcus d. Maul und Klauenseuche. 



In fluid blood-serum growth in upper part of medium, as a bright creamy 



layer, composed of zoogloea of streptococci, with gelatinous envelopes. 

 Habitat. Associated with Maul and Klauenseuche of cattle and sheep. 



