Incubation. — Part II 



1401 



HATCHING TIME 



This is a critical period, and special attention is necessary. In most 

 cases the incubator door should not be opened after the nineteenth day, 



Fig. 37. — Eggs ai fourteenth day of incubation: i, Strong live embryo; 2, live embryo; j, 



weak live embryo; 4,3,6, dead embryos 



and all work requiring handling the eggs or opening the door should be 

 completed on the eighteenth day. The trays should be so arranged that 

 the chicks will drop into the nursery as they come toward the light. If 

 the thermometer in use stands on the tray it should be securely fastened, 

 otherwise the chicks will upset it; this would necessitate opening the 

 machine in order to right the thermometer, or running the risk of a wide 

 variation in temperature. 



