PRACTICAL POULTRY PRODUCTION 



up on the 14th day, showing a 

 clear, distinct hne between the air 

 cell and the growing embryo. 



Eggs with dead germs at the 

 end of 14 days show only partial 

 development and lack a clear dis- 

 tinct line of demarcation between 

 the air cell and the rest of the egg. 

 Care of the incubator at hatch- 

 ing time. When the eggs begin to 

 hatch do not disturb the machine 

 until the hatch is over. The door 

 should not be opened to see how 

 the eggs are hatching, as the mois- 

 ture, which is very essential at this time, will thus be allowed 

 to escape. It is usually advisable to darken the incubator at 

 hatching time by covering the glass in the door with a cloth, 

 so that the chickens will not be attracted to the front part 

 of the machine by the light. When the hatching is com- 



Figure 86. — Homemade egg 

 Candler. The hole for testing 

 eggs should be directly op- 

 posite the flame of the lamp. 



Figure 87. — An infertile egg at the end Figure 88, — A fertile egg after 7 days of 



of 7 days' incubation broken out into incubation broken out into a saucer 



a saucer to show the lack of germ to show the blood veins and develop- 



development. ment. 



