TABLE OF CONTENTS. 



PART I. THE HISTORY OF THE CHICK. 



CHAPTER I. 



The Stbuotuee of the Hen's Eog, and the Changes which take 



PLACE UP TO THE BEGINNINO OF InOUBATION . pp. I — 24. 



The shell and shell-membraiie, i — 3. The albamen, 3. The 

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

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

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

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

 ' 18 — 24. 



CHAPTER II. 



Brief Sdmmary op the whole Histoet of Incubation, 

 pp. 25—47. 



The embryo is formed in the area pellucida, 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. 



