Hatching with Incubators 129 



used are selected and cared for according to the 

 directions given for hatching under hens. They 

 must be collected frequently, selected carefully, 

 with a view td dolor, smooth, perfect shells, 

 and standard size, all dirty eggs being discarded. 

 While waiting for the incubator they must be 

 stored in a cool airy place with a temperature 

 running from fifty to seventy degrees, and turned 

 over half-way every two days or oftener. 



Inside Facts on Eggs. — It will be a great help in 

 handling eggs during incubation if we know some- 

 thing about the development of the germ within 

 the egg. 



Most of us have' probably seen ;the little cluster 

 of yellow balls gathered close to the backbone in the 

 center of the fowl's body cavity. These range in 

 size from that of a pinhead to an inch or more 

 in diameter. They may be seen in the illustration. 



These yellow globes are the yolks of what will be 

 eggs. They are clear yellow yolk, except for one 

 little spot, a germ, on the surface of the egg, or 

 ovum, as it is frequently called at this stage. 



Leading from this group of egg yolks is the 

 oviduct, a very elastic tube, through which the egg 

 passes, adding the white or albumen, and the 



