448 A VARIABLE GALACTAX BACTERIUM. 



Glucose-gelatine stab. — The canal develops as a rough white line, 

 with a moruloid nail-head like the colonies in plate culture. The 

 stab of the derived type was filiform; the nail-head consisted of 

 a raised slime, which became depressed from a consumption of 

 the gelatine. 



Nutrient-gelatine stab. — As in glucose-gelatine, but not so 

 luxuriant. 



Potato. — Dry, buff crusts as on nutrient agar. The altered 

 organism formed a pale buff slime, which gravitated into the 

 cotton wool plug. It became deep j^ellow and dry. 



Bouillon. — The medium becomes slightly viscous and turbid, 

 with a surface ring and a granular deposit. The indol reaction 

 w^as obtained. In nitrate-bouillon, the nitrate is reduced to 

 nitrite. The modified bacterium produced a turbid medium with 

 no surface ring. Otherwise it was as the other. 



Milk. — The medium becomes ropy, especially at the surface, 

 on account of the formation of thick floating zoogloea films. The 

 derived organism produced no apparent change in the medium. 



