600 



Journal of Applied Microscopy. 



apparent. The shelves were necessarily too close together to enable one to 

 easily reach over the cultures standing in front, and the result was that, 

 notwithstanding our cautioning and the intelligent care on the part of the student, 



it not uncommonly happened that cultures 

 were misplaced, or, worse still, pushed from 

 the shelves to the floor with the attending 

 consequences. 



In order to overcome the confusion, acci- 

 dents, and annoyance to students where 

 cultures were misplaced, or perhaps de- 

 stroyed by others in removing those in the 

 rear, the desirability of constructing individ- 

 ual apartments suggested itself. A number 

 of devices were considered, but the one 

 about to be described seemed, all things 

 considered, to be the most practicable. It 

 consists simply of a chest of drawers some- 

 what on the Lillie water-bath pattern, placed 

 within the incubator, each drawer being of 

 sufficient size to furnish storage for the 

 working cultures of one student. This re- 

 moves all possible excuse for meddling 

 with the cultures of others, and the drawer 

 also affords a convenient tray in which to 

 transfer cultures from incubator to work 

 table and vice versa. 

 As already stated, we had the large Weisnegg form of incubators. These 

 are heated by the radiation from a metal plate at the top and one at the bottom, 



Fig. 3- 



A photograph of incubator with framework 



for drawers. 



Fig. 4. 

 A photograph of incubator drawers showing different views. 



and metal tubes connecting them. The tubes are arranged at the two sides and 

 back and are placed close to each other (see Fig. 1). This arrangement gives 



