THE INCUBATOR. 



153 



to prevent radiation of heat and consequent fluctuations 

 in temperature. In the top of the chamber is a small 

 opening through which a thermometer projects into its 

 interior. At either corner, leading into the space con- 

 taining the water, are other openings for the reception 



FIG. 29. 



Incubator used in bacteriological work. 



of another thermometer and a thermo-regulator, and for 

 refilling the apparatus as the water evaporates. On the 

 side is a water-gauge for showing the level of the water 



