THE CLASSIFICATION OF BACTERIA 91 



CLASS V. DOUBTFULLY CHROMOGENIC ; i.e. GROWTH ON GELATIN 

 OR AGAR LIGHT YELLOW TO YELLOWISH WHITE. GELATIN 

 LIQUEFIED. 

 I. Cocci surrounded by a capsule. 



47. M, Heydenreichii. 



I. Cocci not surrounded by a capsule. 



A. Gonococcoid forms. 



48. M. hcemorrhagicus Klein. 



B. Cocci only as tetrads, merismopedia forms. 



49. M. expositionis. 



C. Cocci in irregular groups. 



1. Liquefaction of the gelatin takes place only at the surface crateri- 



form. 



50. M. Finlayensis Sternberg. 



51. M. descidens Fliigge. 



52. M. alpha Foutin. 



53. M. tetragenus-pallidus Dyar. 



2. Gelatin liquefied along the length of the needle track. 



54. M. cremoides Zimmerman. 



47. M. Heydenreichii 



M. of Briska-button Heydenreich : Centralblatt f. Bakteriologie, V, 1888, 163. 



Morphology. Diplococci 0.8-1.0 p., or tetrads, surrounded by a capsule. 



Gelatin stab. In 48 hours a grayish white beaded growth in depth ; on the 

 surface growth thin, yellowish white ; in 3 days a liquefied funnel. 



Agar slant. Growth grayish white yellowish, with a varnish-like lustre. 



Potato. Growth white, yellow. 



Pathogenesis . Inoculations of rabbits, dogs, chickens, horses, and sheep pro- 

 duce a skin affection identical with briska-button. 



Habitat. Found by H. in pus and serous fluid from tumors and ulcers in 

 an Oriental skin affection briska-button. 



48. M. haemorrhagicus E. Klein 



Centralblatt f. Bakteriologie, XXXII, 1897, 81. 



Morphology. Cocci 0.4-0.6 /x, of gonococcoid type. Stain by Gram's method. 



Gelatin colonies. Surface : 24 hours, small round gray points ; microscopi- 

 cally, with thick centres and thin borders. In 48 hours the gelatin softens, 

 and colonies are surrounded; by a zone of fluid gelatin ; the central colony 

 slightly yellowish. 



