Fig. 7. Embryo (after seventy-two hours' incubation)
Fig. 8. Embryo (after seven days' incubation)
[1] Photographs (Figs. 4-8) from Bureau of Animal Industry, United States Department of Agriculture.
Fig. 9. Chick ready to break shell
Fig. 7. Embryo (after seventy-two hours' incubation)
Fig. 8. Embryo (after seven days' incubation)
[1] Photographs (Figs. 4-8) from Bureau of Animal Industry, United States Department of Agriculture.
Fig. 9. Chick ready to break shell