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The Cornell Reading-Courses 



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 ther- 

 mometer in use stands on the tray it shoiild be securely fastened ; other- 

 wise the chicks will upset it, and this will necessitate opening the door 



Fig. 72. — Eggs at fourteenth day of incubation: i, Strong live embryo; 2, lie embryo; 3, 



weak live embryo; 4, 5, 6, dead embryos 



of the incubator in order to right the thermometer, or running the 

 risk of a wide variation in temperature. 



A temperature higher than 105° F. and one lower than 103° F. should 

 be avoided at this time. Both these undesired extremes will occur at 

 some time during the hatching period unless careful provision is made 

 against them. It would be much better to remove the lamp for a time 



