APPARATUS, MATERIAL, AND REAGENTS. 37 



and roof jacketed with felt. Water fills the inter- 

 space between the walls, 

 and on the roof are two 

 apertures, one for a gas 

 regulator, and the other 

 for a thermometer. In 

 front, the chest is closed 

 in by a sheet of felt, a 

 glass door, and a sliding 

 glass panel. The appa- 

 ratus can be suspended 

 on the wall or supported 

 on legs, and is heated 

 from below by means of 

 protected burners. 

 The gas should pass 



FIG. 21. BABES INCUBATOR. 



first through a pressure- 

 regulator, and then through a thermo-regulator to 

 the burners. 



The thermo-regulator of Reichert (Fig. 22) consists of 

 three parts a hollow T piece, a stem, and a 

 bulb. The T piece fits like a stopper in the 

 upper widened portion of the stem. One arm 

 of the T is open, and connected with the gas 

 supply ; the vertical portion terminates in a 

 small orifice, and is also provided with a minute 

 lateral opening. The stem is provided with a 

 lateral arm, and this arm, the stem, and the 

 bulb contain mercury. The regulator is fixed 

 in the roof of the incubator, so that the bulb 



R ^ ICHERT ' S projects either into the interior of the incubator 



THERMO- . 



REGULATOR, or into the water chamber. When the mcu- 



