112 



BACTERIOLOGY. 



in either asbestos boards or thick felt to prevent radia- 

 tion of heat and consequent fluctuations in temperature. 

 In the top of the chamber is a small opening through 



Fig. 26. 



Incubator used in bacteriological work. 



which a thermometer projects into its interior. At 

 either corner, leading into the space containing the 

 water, are other openings for the reception of another 

 thermometer and a thermo -regulator, and for refilling the 

 apparatus as the water evaporates. On the side is a 



