TABLE OF CONTENTS. 



PART I. THE HISTORY OF THE CHICK. 



CHAPTER I. 



The Steuctuee of the Hen's Egg, and the Changes which take 



PLACE UP TO the BEGINNING OF InCUBATION . pp. I 24. 



The shell and shell-membrane, i 3. The albumen, 3. The 

 vitelline membrane, 4, The yolk, 5 7. Area opaca, 7. Area 

 pellucida, 8. The structure of the blastoderm, 7 10. Recapitu- 

 lation, 10. The ovarian ovum, 11 15. The descent of the ovum 

 along the oviduct, 15 17. Impregnation, 17. Segmentation, 

 1824. 



CHAPTER II. 



Brief Summaey of the whole History of Incubation, 

 pp. 2547. 



The embryo is formed in the area peUucida, 25. The germinal 

 layers, 25, 26. The extension of the blastoderm over the yolk, 26. 

 The vascular area, 27. The head-fold, 27 36. The tail-fold, 37. 

 The lateral folds, 37. The yolk-sac, 37. The alimentary canal, 39. 

 The neural tube, 39, 40. The body-cavity, 41. The somatopleure, 41. 

 The splanchnopleure, 42. The stalk of the yolk-sac, 42, 43. The 

 amnion, 43 46. The allantois, 46, 47. 



