cooled quicker than in warm weather. When she 

 leaves her nest once a day for food she returns 

 quickly. The same course must be pursued with 

 the incubator, i. e., the eggs must not be exposed 

 as long in cold as in warm weather. 



Once a day, beginning with the second and end- 

 ing with the eighteenth day, the eggs should be 

 cooled to about 80 Fahrenheit, not cooler. This 

 can be done after turning them in the morning. 

 One soon learns to tell the degree of heat by lay- 

 the hand on the eggs or by holding an egg against 

 the face. When the surface of the egg indicates 

 80 the inside is of course warmer. 



The incubator should always be closed while the 

 eggs are out cooling, for it is not desirable to cool 

 the machine. When the hen leaves her nest she 

 does not dive into the water or sit upon a cake of 

 ice. When the eggs are out of the incubator it 

 takes more heat to keep the egg chamber at the 

 proper temperature, and the regulator, if it is a 

 good one (and an incubator without a regulator is 

 behind the times), will turn on extra heat, and 

 when the cooled eggs are replaced, will turn on 

 still more, automatically, which is turned off again 

 in the same way when the egg chamber recovers 

 its proper temperature. 



Nine-tenths of the successful users of incubators 

 cool the eggs ; so do the manufacturers of incu- 

 bators when they want to make a good hatch. 

 Cooling the eggs is one of the important items in 

 incubation, but not the only one, you will not suc- 

 ceed if you neglect the others. 

 34 



