33 



Bacillus arborescens, from London water ; bacilli with round ends, 

 2"5 /«. long, in flexible filaments ; motility doubtful ; freely- 

 branching colonies, becoming yellowish-green and strongly 

 iridescent. 



Bacillus radiatus (Luderitz), obtained from garden earth by inocula- 

 tion through guinea-pigs ; bacilU with roimd ends, 4 to 7 /* long, 

 forming long filaments ; the colonies are surrounded by inter- 

 lacing fibrils resembling a mycelium, and give off an unpleasant 

 odour ; blood serum is rapidly liquefied. 



Bacillus pyocyaneus (Ernst), from green pus ; slender bacilli, 2to i fi 

 long ; differs from the bacillus of Gressard in being non-patho- 

 genic; the brown growth on potatoes, when touched with 

 a platinum needle, becomes dark-green, fading to brown again 

 in half an hour (chameleon phenomenon). 



Bacillus cuticularis. See p. 40, the motility being doubtful. 



