■ INCUBATION 163 



eighth day. If very doubtful about them, perhaps 

 a second test might be given on the fourteenth day, 

 not later, because between the tenth and eighteenth 

 days is the most critical period in the life of the 

 embryo. 



In selecting eggs for hatching use only those 

 that are of uniform size and color, with smooth, 

 strong shells. Abnormal eggs are likely to pro- 

 duce weak or crippled chicks. The eggs should 

 be stored in a room where the temperature ranges 

 from 50 to 60 degrees. It has been a prevailing 

 idea that eggs for hatching should be turned daily. 

 Several men of authority claim that this is not 

 necessary, but the case is not definitely proved. | 

 Eggs kept for a week or more should be turned at 

 least twice a week. It can do no harm and may 

 prove beneficial. Never set dirty eggs; if they are 

 dirty, carefully wipe them with a damp cloth until . 

 all spots are removed. 



SHIPPING EGGS FOR HATCHING 



The three most important points to be considered 

 in packing and shipping eggs for hatching are : First, 

 the boxes and filling should be as light as possible 

 consistent with strength and rough handling; second,] 

 the handles of boxes must be so constructed that 

 freight cannot be piled on top and thus crush them ; 

 third, the eggs must be prevented from jarring, and 

 yet must not be packed so tightly as to cause break- 

 age from pressure. 



Light wooden boxes have proved most satisfac- 

 tory with many poultrymen. They should be of 

 enough depth to insure an inch of excelsior below 

 the lowest,, layer. When used they are packed;^ 



