through one or a dozen hatches, except it were 

 necessary (as is frequently the case) to draw off a 

 quantity when overheated and to add cold water 

 to hasten the reduction of temperature. 



But as far as supplying moisture to the eggs 

 not a drop is supplied by the hot water tank. 

 There is no moisture from the hot water ! Now 

 where is the ' ' moist heat ? " 



How do all hot water incubators, as well as all 

 hot air incubators, get their moisture ? 



From open pans above or below the eggs. 



If moisture oozed from the hot water tank there 

 would be no necessity for moisture pans. 



Now let us look at the hot air incubator. It has 

 a heater over the eggs, just as the hot \Vater 

 machine has. You can call it a tank or a reser- 

 voir, and it is perfectly air-tight in relation to the 

 egg chamber. The egg chamber is heated by 

 radiation from the lower surface of this tank or 

 reservoir, and it gives just as much moisture to 

 the eggs as does the heat which radiates from the 

 lower surface of the hot water tank which is 

 none whatever ! Neither can it give any fumes, 

 because neither gas nor water can penetrate the 

 metal radiator which has no opening whatever into 

 the egg chamber. The heat or hot air does not 

 pass from the lamps to the egg chamber any more 

 than it does in the hot water incubator. 



The moisture is supplied from open pans above 

 or below the eggs, just the same as it is in the hot 

 water machine. 



Now in the face of these facts is it not ridicu- 



21 



