244 BACTERIOLOGY. 



Bacterium Pasteurianum, Hansen. Morpho- 

 logically similar to Bacterium aceti, but the cells 

 contain a starch-like substance, which is turned blue 

 by iodine. They occur in beer-wort. 



Bacterium liodermos (Bacillus liodermos, 

 Fliigge. Potato bacterium). Short rods with 

 rounded ends, motile. On plate-cultivations the 

 colonies appear as small white pellicles floating 

 on liquefied gelatine. In test-tubes the gelatine 

 is liquefied, and the growth sinks down in floc- 

 culent masses. They occur on potatoes, forming 

 a smooth shining layer, which ultimately becomes 

 crumpled. 



Bacterium multipediculum (Bacillus multipedi- 

 culus, Fliigge). Long slender rods. They form 

 peculiar insect-like colonies on plate-cultivations. 

 In test-tubes the appearance is less characteristic. 

 They occur on potatoes, forming a dirty yellow 

 growth. 



Bacterium ramosum liquefaciens (Bacillus 

 ramosus liquefaciens, Fliigge). Rods, slowly motile. 

 They form characteristic colonies on plate- 

 cultivations. The colonies gradually sink down, 

 forming a well-marked funnel with later an 

 appearance of concentric rings. In test-tubes the 

 funnel-shaped liquefaction sends off rays into the 

 surrounding gelatine. They occur occasionally, 

 contaminating cultivations. 



Bacterium Zopfii, Kurth. Cocci, i 1*25 ^ in 

 diameter ; rods, and threads. Cultivated in a streak 



