THE INCUBATOB. 



143 



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 

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

 taining the water, are other openings for the reception 



Incubator used in tacteriological wort. 



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 



