POULTRY LABORATORY GUIDE 37 



form of a circle or semicircle around the germ 

 is dead, the blood of the embryo having settled 

 on the shell. 



An egg on which the germ appears clear and 

 distinct as a single dark spot against the shell is 

 dead, having become fastened to it by insufficient 

 turning. Remove all eggs containing dead 

 germs, and when through testing bury them. 



An egg showing an air cell and a small, poorly 

 developed germ is weak, and the chances are that 

 it will die. It should, however, be left in the 

 machine until the fourteenth day. 



When through testing, place all good eggs with 

 normal germs in the machine immediately, and 

 record the number of eggs tested out under their 

 proper headings on the incubator record. 



On the fourteenth day proceed in the same 

 manner as in the first test. At the second test 

 there are two objects in view, namely: ob- 

 serving the increase in the size of the air cell and 

 determining whether it is normal or not, also the 

 taking out of any egg, the germs of which were 

 doubtful or have died since the first test. 



A normal egg at this time should have a large, 

 distinct air cell with the edges clear cut, about 

 five eighths of an inch deep. The whole centre of 

 the egg should be uniformly dark in color, nearly 



