LOADING EGG TRAYS 



251 



reserve so far as a deficiency in heat is concerned, by reason of 

 the heat generated by the embryos. From the fourteenth day 

 this natural heat is quite noticeable. 



Cases have come to my attention in which chickens have 

 hatched from eggs left out of the incubator all night, due to for- 

 getfulness. Therefore, if you meet with accidents, do not as- 

 sume that the hatch is ruined, and destroy the eggs; but correct 

 the error, and then in a day or so test the eggs to see what dam- 



Fig. 159. — Design for concrete incubator cellar. 



age, if any, has been done. It is surprising to learn the extent 

 of improper usage and handling to which eggs, can be subjected 

 at times, and still develop into perfectly formed chicks. I have 

 thrown presumably unhatchable eggs into a manure pit, and had 

 them hatch chicks. , 



Loading the Trays. — If a machine can be operated for a couple 

 of days with no appreciable variation in temperature, one can 

 feel reasonably sure there is no fault in its mechanism, and that 

 it is safe to commence hatching. Place the eggs on the travs on 



