66 INCUBATORS 



SECTION IV. INCUBATORS HEATED BY PETROL, GASOLINE, 

 OR PETROLEUM OIL. 



When neither coal gas nor electricity are available as sources of heat, it 

 is difficult to regulate the temperature of an incubator satisfactorily. 



In these cases, incubators heated by petrol (Lion's, d'Arsonval-Adnet's, 

 Hearson's) or by gas manufactured on the spot from gasoline (Roux's, Hear- 

 son's), [or by petroleum oil (Hearson's)] should be used, but they all require 

 a good deal of supervision. 



