DESCRIPTION OF SPECIES. 



525 



Colonies circular, later irregular, 

 granular, strongly refractive and 

 yellowish - brown. They are 



probably identical with Bacillus coli 

 communis. 



They were isolated from cases of 

 cholera at Naples. 



Bacillus necrophorus (Loffler). 

 — Rods and filaments. 



They cannot be cultivated on the 

 ordinary media. In rabbit broth 

 they give rise to fluffy masses of 

 filaments. 



Intravenous injection produced 

 in rabbits a pyaemic condition in 

 about a week. The bacilli were 

 found in the pus. 



They were isolated from a rabbit 

 which had been inoculated with 

 fragments of a condyloma. 



Bacillus nitrifi.caiis (Wino- 

 gradsky). — Very small rods -5 /i in 

 in length, singly and in zooarlcea. 



Colonies in silica jelly are 

 lenticular, and sub-cultures in liquid 

 media produce a gelatinous de- 

 posit: They are powerful oxidising 

 agents. 



They were isolated from the soil. 



Bacillus nodosus parvus 

 (Lustgarten). — Rods 1"2 to 2'4 ^ in 

 length, -4 ^ in width ; singly and 

 in pairs. 



Inoculated in the depth of agar 

 they produce a white filament in 

 the track of the needle composed 

 of crowded colonies, and on the 

 surface a hemispherical glistening 

 growth. 



They were isolated from the 

 human urethra. 



Bacillus nubilus(Frankland). — 

 Slender rods 3 fL long and '3 /i wide, 

 and threads. Single bacilli have an 

 active rotatory movement, but the 

 long threads in broth cultures are 

 quite motionless. Spore-formation 

 not observed. 



The colonies appear as cloudy 

 undefined patches, which rapidly 

 liquefy the gelatine. They consist 

 of a tangled mass of threads. 



Inoculated in the depth of gela- 

 tine they produce along the track 

 of the needle horizontal circular 

 plates, with a delicate cloud-like 

 appearance, and liquefaction at the 



upper part. Later the whole of 

 the gelatine is liquefied. 



On agar they form a thin opales- 

 cent blue-violet film, the edges of 

 which exhibit later a distinct violet 

 fluorescence. 



On potato there is a slightly 

 yellow growth which is scarcely 

 visible. 



Broth is rendered turbid with a 

 dirty-white deposit, the surface 

 being covered by a thin pellicle. 



They occur in water. 



Bacillus ochraceus (Zimmer- 

 mann). — Rods 1'25 to 4-6 ;u in 

 length ; '65 to '70 ii, in width ; 

 singly, in pairs, chains, and fila- 

 ments ; capsulated. 



Colonies circular, granular, yel- 

 low, liquefying. 



Inoculated in the depth of gela- 

 tine they produce liquefaction in 

 the track of the needle, and a 

 yellow deposit. 



On agar and potato the growth 

 is yellow ochre in colour. 



They occur in water. 



Bacillus oedematis aerobicus 

 (Klein). — Rods -8 to 2'4 /n in length, 

 ■7 n wide, and long filaments. 



Colonies greyish, transparent, 

 with irregular contour. 



In the depth of gelatine a fila- 

 ment occurs in the track of the 

 needle, and gas bubbles in isolated 

 colonies in its lower part, and a 

 transparent patch with irregular 

 margin on the free surface. 



On the surface of agar they pro- 

 duce a greyish-white layer. 



In broth there is turbidity with 

 flocculi. 



On potato the growth is yellowish 

 and viscid. 



They give rise to extensive cedema 

 in guinea-pigs, and in a less marked 

 form in rabbits. 



They occur in earth. 



Bacillus oedematis maligni 

 (p. 220). 



Bacillus of Belfanti and Pas- 

 cavola. — Very short rods. 



Colonies circular, granular, yel- 

 lowish-grey. 



Inoculated in the depth of gela- 

 tine they produce a filament com- 

 posed of closely-packed minute 



