Fii;. 2liS. r.iyhtccM hours l-io. 2iS(|. Second day Fiu. 290. Forty hours 



Fii;. 2yt. Tliird day Via. 2<jz. Fourth day Fig. jcij. Fifth d;iy 



Fig. 294. Fertile egg seen Fig. 295. Fertile egg, Fig. 296. Chick just be- 

 through tester, seventh day fourteenth day fore hatching 



DEVELOPMENT OF CHICK IN INCUBATION 



(Photographs from E. T. Brown, made by E. C. Hearson, London, England. 

 Figs. 288-293 and 296 show contents of egg with shell removed) 



261 



