36 EXPERIMENTAL DAIRY BACTERIOLOGY 



Laboratory Bacteriology, and Chester's Determinative Bacteri- 

 ology, and also Appendix B. 



Exercise. Each student will prepare from the mixed culture fur- 

 nished him a set of plates, using agar as the culture medium, and will 

 isolate the different organisms in pure culture and make a detailed 

 cultural study of the same. From the different types of colonies on 

 the agar plates inoculate agar slopes. Incubate these from twenty- 

 four to forty -eight hours, select two of each type for further study, 

 making agar-stab, gelatin-stab, and nutrient-broth cultures from 

 each ; also prepare gelatin plates. 



