164 BA CTERWLOG Y. 



culture of the organisms of which the colony was 

 composed. 



Cultures of this form are not only useful as a means 

 of preserving the different organisms with which we 

 may be working, but serve also to bring out certain 



FIG. 33. 



Series of stab-cultures in gelatin, showing modes of growth of different 

 species of bacteria. 



characteristics of different organisms when grown in 

 this way. 



If gelatin be employed and the organism which has 



