DESCRIPTION OF SPECIES. 



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 p. ; 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 aerophilus (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 n in length, '75 /z 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. 



On 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 subcutaneously 

 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. - :J 



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 /u in length, '5 p. in 

 width, and in chains. The rods 

 develop cocci-forms united by a 

 gelatinous substance into zooglcea 

 masses. They were isolated from 

 a contaminated culture. 



Bacillus allii (Griffiths). Rods 



