DESCRIPTION OF PLATE III. 



Plate-cultivation. 



This represents the appearance of a plate-cultivation of the comma-bacillus 

 of Cholera nostras, when it is examined over a slab of blackened plate-glass. 

 The drawing was made from a typical result of thinning out the colonies by 

 the process of plate-cultivation. At this stage they were completely isolated 

 one from the other ; but later they became confluent, and produced complete 

 liquefaction of the gelatine. 



