24 



Prepare a " moist chamber" in the same way as for 

 potato cultures except that tap water may be used for 

 moistening instead of mercuric chloride. On three small 

 pieces of paper write the name of the germ or material, 

 the number of the plate and date. Now place a glass bench 

 on the bottom of the moist chamber and on it the label 

 for plate 1. Transfer the gelatin plate from the ice appa- 

 ratus to the bench. Pour the remaining gelatin tubes on 

 plates in the same manner as described and when cool 

 transfer to the benches which are arranged one above the 

 other, in the moist chamber. Each chamber can hold a 

 stack of six plates. 



The moist chamber containing the plates is now set 

 aside for 1-2-3 days, during which time colonies will 

 develop and be ready for further examination. 



LABORATORY WORK. Make plate cultures of Micrococ- 

 cus prodigiosus and of Bacillus Indicus. 



