DESCRIPTION OF SPECIES AEEANGED FOE 

 REFEBENCE IN ALPHABETICAL OBDEB. 



Ascococcus Billrothii. Small 

 globular cocci, united into charac- 

 teristic colonies. 



They form on the surface of 

 nourishing fluids a cream-like skin, 

 divisible into an enormous number 

 of globular or oval families. Each 

 family is surrounded by a thick 

 capsule of cartilaginous consistency. 

 In a solution containing acid tar- 

 trate of ammonia the fungi generate 

 butyric acid, and change the origin- 

 ally acid fluid into an alkaline one. 



FIG. 198. Ascococcus BILLROTHII 

 (Cohn). 



They were first observed on putrid 

 broth, and later on ordinary nourish- 

 ing solutions ; they also readily de- 

 velop upon damp slices of boiled 

 roots, carrots, beetroots, etc. 



Ascobacillus citreus (Unna, 

 Tommasoli). Rods sometimes 

 curved, T3 p. in length, '3 p in width, 

 singly, in pairs, and masses. The 



colonies develop slowly, and are 

 yellowish in colour. 



The cocci inoculated in the depth 

 of gelatine form small colonies in 

 the track of the needle, and a slimv 

 pale-yellow growth on the surface"; 

 liquefaction sets in slowly. 



On agar the growth is gelatinous, 

 and orange in colour, and rapidly 

 extends over the surface. 



On potato the growth is abundant, 

 and pale yellow. 



They were isolated from the skin 

 in eczema seborrhoeicum. 



Bacillus acidiformans (Stern- 

 berg). Short rods, 1 -5 to 3 p in 

 length, 1'2 /i in width, and filaments 

 5 to 10 p. 



Colonies circular ; iridescent by 

 reflected light. 



Inoculated in the depth of gela- 

 tine they grow freely in the track of 

 the needle, and form a hemispherical 

 mass on the surface. They produce 

 gas bubbles. 



On agar the growth is milk-white, 

 and the jelly becomes strongly acid. 

 On potato the growth is abundant. 



In broth with 5 per cent, glycerine 

 they produce opacity and a copious 

 viscid deposit, and the surface is 

 covered with gas bubbles. 



Injected into the peritoneal 

 cavity of rabbits and guinea-pigs, 

 they produce death in twenty-four 

 hours. 



They were isolated from the liver 

 in a fatal case of yellow fever. 



Bacillus acidi lactici (Hueppe). 

 Rods 1 to 2'8 /LI long, and '3 to 

 '4 /x wide, and thread forms. Spore- 

 formation present. In gelatine 



498 



