DESCRIPTION OF SPECIES. 



499 



cultures the breadth of the rods is 

 diminished. They grow best be- 

 tween 35° and 42° C, and cease 

 under 10° C. Over 45-5° C. they 

 no longer produce acidity. 



Whitish colonies appear on the 

 second day. 



In gelatine a delicate growth 

 appears along the whole track of 

 the needle, with spherical forms 

 here and there. 



In milk they produce lactic acid 

 and the casein is precipitated. 



Bacillus aerogenes (Miller).— 

 Small rods varying in length. 

 Colonies white or yellowish-white ; 

 concentric. 



In the depth of gelatine they 

 produce a yellowish filament, and 

 on the surface a grey patch with 

 dentated periphery ; later the fila- 

 ment is brown. 



On potato, the growth is yellowish 

 and dry. 



They were isolated from the in- 

 testine in health. 



Bacillus aerogenes capsulatus 

 (Welch). — Rods straight or slightly 

 curved, 3 to 6 /x ; threads and 

 chains ; capsulated. 



Colonies on agar greyish-white, 

 with hairy processes. 



They peptonise gelatine and pro- 

 duce gas. Broth becomes turbid, 

 and there is an abundant sediment. 

 Milk is coagulated. Cultures have 

 a faint smell of glue. 



Injected into rabbits they pro- 

 duce gas in the blood and internal 

 organs. 



They were isolated from a patient 

 after death, with blood-vessels full 

 of gas. 



Bacillus aeropMlus (Liborius). 

 — Rods and filaments. 



Colonies punctiform ; greyish- 

 yellow. 



Inoculated in the depth of gela- 

 tine the bacilli produce a funnel of 

 liquefied jelly, with flocculi in the 

 lower part. 



On potato they form a smooth 

 yellowish layer. 



They were isolated from con- 

 taminated cultures. 



Bacillus albus (Eisenberg). — 

 Rods and chains. 



Colonies circular, white. 



In gelatine the bacilli grow in the 

 track of the needle, and form a 

 white hemispherical mass on the 

 free surface. 



On agar the growth is pure white, 

 and on potato yellowish- white. 



They occur in water. 



Bacillus albus anaerobiescens 

 (Vaughan). — Short rods. 



Colonies circular, yellowish- 

 brown. 



Inoculated in the depth of gela- 

 tine they grow in the track of the 

 needle, and on the free surface. 



On agar the growth is pure white, 

 and on potato yellowish-white. 



They occur in water. 



Bacillus albus cadaveris 

 (Straussmann and Strieker). — Rods 

 ■2-5 fi in length, '7.5 ii in width, and 

 filaments. 



Colonies yellowish ; circular, and 

 later radiated. 



Inoculated in the depth of gela- - 

 tine they produce a funnel of lique- 

 fied gelatine with a thick deposit. 



On agar there is an abundant 

 white growth. 



Ou potato the growth is white or 

 yellowish-white, and colours the 

 potato in the vicinity bluish-brown. 

 The cultures have a putrefactive 

 odour. 



Mice inoculated subcutaueously 

 die in six hours, and guinea-pigs in 

 twenty-four. 



They were isolated from putrid 

 human blood. 



Bacillus albus putidus (De 

 Bary). — Rods and filaments. 



Colonies circular and brownish. 



Inoculated in the depth of gela- 

 tine they ,. produce rapid lique- 

 faction. 



On agar and potato the growth 

 is slimy. Cultures develop a strong 

 putrefactive odour. 



They occur in water. 



Bacillus allantoides (L. Klein). 

 — Rods 2 to 2-5 /i in length, '5 ju. in 

 width, and in chains. The rods 

 develop cocci-forms united by a 

 gelatinous substance into zoogloea 

 masses. They were isolated from 

 a contaminated culture. 



Bacillus allii (Grifiiths). — Rods 



