38 



THE OEGANISM IS A BACILLUS. 



THE GELATINE IS LIQUEFIED. 



THE OEGANISM IS NON-MOTILE AND CHKOMO- 

 GBNIC. 



THE COLONIES AKE VIOLET. 



Bacillus membranaceus amethystinus (Eisenberg), from weU -wa 



at Spalato. 

 Bacillus coeruleus, from the water of the Schuylkill Eiver ; produces 



a beautiful blue pigment ; the colonies on potato are dark-blue, 



later becoming almost black. 



