170 A MANUAL OF BACTERIOLOGY 



best for the cultivation of this microbe. It measures 

 from 1 to 2 p in length, and 0*25 //, in breadth. 



Bacillus figurans. This microbe was first de- 

 scribed by Crookshank, 1 and occurs in soil and in 

 the atmosphere. It has rounded ends, and forms 

 spores. On the oblique surface of agar-agar it 

 forms a feather-like growth. On gelatine plates 

 B. figurans causes ' a cloudy growth, spreading from 

 various points/ When ' cultivated in nutrient gela- 

 tine this bacillus forms on the surface visible wind- 

 ings, from which fine filaments grow down into the 

 gelatine. They spread out also in almost parallel 

 lines transversely from the needle track.' 



Bacillus Hansenii. The rods measure 2 '8 to 6 p 

 x 0'6 to 8 //,, and are best cultivated on steamed 

 potatoes, where they form a deep yellow layer, 

 which has the odour of amylic alcohol. Ultimately 

 the yellow layer dries, and changes to a brown 

 colour, at the same time forming spores (1*7 JJLX 

 1-1 /*,). This bacillus occurs on bouillon, wine, and 

 malt infusions, which have been kept at about 

 32 C. 



VIBRIONES. 



These microbes are rod-shaped, but not straight ; 

 they are more or less wavy, and they are motile. 



Vibrio serpens. This vibrio measures from 1 1 to 

 25 fju long, and from 0'8 to M //, in breadth. It 

 occurs in various infusions. 



Vibrio rugula. The rods measure from 6 to 16 yu, 

 in length, and about 0*5 to 2*5 //, in breadth. They 

 are curved or S-shaped, and bear a flagellum at each 



1 Lancet, 1885. 



