508 



DESCRIPTION OF SPECIES. 



lactic acid bacillus is growing be- 

 comes sky-blue from the first. 



They are non -pathogenic. 



They are present in blue milk. 



Bacillus cyanogenus (Jordan). 

 Rods 1'3 //. in length, '8 p. in 

 width. Slightly motile. 



Colonies granular and irregular. 

 They colour the surrounding gela- 

 tine brown. 



Inoculated in the depth of gela- 

 tine the bacilli produce a scanty 

 growth in the track of the needle, 

 and a film on the surface with 

 coloration of the gelatine beneath 

 it. 



On agar they form a white layer, 

 and the jelly is coloured brown. 



On potato the growth is brown. 



They were isolated from sewage. 



Bacillus cystiformis (Clado). 

 Short slender rods. Motile. 



Colonies circular, yellowish, gra- 

 nular. 



Inoculated in the depth of gela- 

 tine there is a scanty growth in the 

 track of the needle, and a white 

 patch on the free surface. 



On agar the growth is yellowish- 

 white. 



They were isolated from urine. 



Bacillus delicatulus (Jordan). 

 Rods 2 p. long and 1 p, broad, 

 often in pairs or short chains. 

 Actively motile. Spore-formation 

 not observed. 



Colonies at first whitish with 

 a radiating edge. Later they 

 liquefy the gelatine and the centres 

 become dark. 



Inoculated in the depth of gela- 

 tine they rapidly liquefy it and 

 form a whitish pellicle and a brown 

 deposit. 



On agar a greyish crinkled 

 growth appears, which gradually 

 becomes white and shining. 



On potato there is a grey flat 

 growth. 



Milk is coagulated and becomes 

 strongly acid. 



Broth is made turbid and a white 

 serum and precipitate formed. 



They occur in sewage. 



Bacillus dentalis viridans 

 (Miller). Rods slightly bent, singly 

 and in pairs. 



Colonies circular, yellowish and 

 concentric. 



Inoculated in the depth of gela- 

 tine they grow in the track of the 

 needle and on the free surface, and 

 the jelly is coloured green. 



On agar the growth is colourless 

 or slightly grey. 



Intraperitoneal injections in mice 

 and guinea-pigs produce a fatal re- 

 sult. Subcutaneous injections cause 

 suppuration. 



They were isolated from caries 

 of the teeth. 



Bacillus dentriticus (Bordoni 

 Uffreduzzi and Lustig). Rods '85 

 to 2-8 p. long, and '5 to '85 p. broad, 

 singly and in zoogloea. Motile. 

 Spore-formation not observed. 



Colonies have an arborescent 

 appearance. 



Inoculated in the depth of gela- 

 tine they form a circular raised 

 growth at the point of puncture, 

 and white colonies along the needle 

 track. The jelly is gradually 

 liquefied. 



On agar and blood serum there 

 is a scanty growth on the surface 

 and an abundant growth in the 

 track of the needle. Blood serum 

 is liquefied after some time. 



Broth is rendered turbid ; a 

 white firm pellicle forms. 



On potato there is a thick moist 

 white growth, which later becomes 

 yellow. 



Found in water. 



Bacillus devorans (Zimmer- 

 mann). Rods -99 p. to 1'2 p in 

 length, '74 p. in width ; singly, in 

 pairs and in chains. 



Colonies are circular, granular, 

 and grey, with periphery formed of 

 radiating processes. 



In the depth of gelatine they 

 produce a whitish filament and an 

 excavation at the upper part, which 

 may or may not contain liquefied 

 jelly. 



On agar a greyish film is found. 



They do not grow on potato. 



They occur in water. 



Bacillus diffusus (Frankland). 

 Rods 1-7 /x in length, '5 p. in 

 width ; singly, in pairs, and fila- 

 ments. 



