1400 



The Cornell Reading-Courses 



day, the size of the cell varying with the individual eggs in the same incu- 

 bator or under the same hen. The air cells in eggs under the hen are 



Fig. 36. — Dead germs seventh day of incubation (2,j,4,3,and6), to be compared with a live 

 germ as seen in i and in Fig. J5 {4 and 5): i,Live germs in a doubte-yolked egg; 2, blood 

 ring and germ stuck to shell; j, blood ring; 4, floating germ; 5, floating germ and blood 

 ring; 6, blood ring 



usually the smallest. Eggs incubated in a moisture machine generally 

 have smaller air cells than those in non-moisture incubators. The air 

 cell is ordinarily found at the large end of the egg, but occasionally one is 

 found a little at one side or near the small end. Various positions of the 

 air cell, and also the comparative sizes of the air cell at different periods of 

 incubation, are shown in Figs. 38 and 39. 



