210 



Farm Poultry 



The ideal condition as to purity will approximate 

 the air out-of-doors where there is a free circulation. 

 The air should also contain at least a moderate 

 amount of moisture. The amount of moisture in the 



FIG. 67. An incubator house Rhode Island Agricultural Experiment Station. 



atmosphere should control, to some extent, the 

 ventilation of the incubator. It is desirable that a 

 considerable proportion of the moisture of the egg 

 be evaporated during the process of incubation. If 

 the air is very dry, a little ventilation will be suffi- 

 cient to secure the desired evaporation, while a 

 moist atmosphere would require much more ventila- 

 tion to secure the same result. The moist air of 

 a wet cellar which contains decaying fruit and vege- 

 tables is not suited to incubation. 



Whenever kerosene oil lamps are kept contin- 

 ually burning for weeks at a time, as they are in 

 incubators, there is some danger from fire. It is true 



