Template:1 Foster 1883
From Embryology
The History of the Chick: The structure of the hen's egg, and the changes which take place up to the beginning of incubation | A brief summary of the whole history of incubation | The changes which take place during the first day of incubation | The changes which take place during the first half of the second day | The changes which take place during the second half of the second day | The changes which take place during the third day | The changes which take place during the fourth day | Book - The Elements of Embryology - Chicken 8The changes which take place on the fifth day | From the sixth day to the end of incubation