TABLE OF CONTENTS. 



INTRODUCTION ... , pp. i 10. 



PART I. THE HISTORY OF THE CHICK. 



CHAPTER I. 



THE STRUCTURE OP THE HEN'S EGG, AND THE CHANGES WHICH TAKE PLACE 

 UP TO THE BEGINNING OP INCUBATION . . pp. II 26. 



i. The shell, i. The shell-membrane. 3. The albumen. 4. The vitelline 

 membrane. 5. The yolk. 6. The yellow yolk. 7. The white yolk. 8. The 

 white yolk-spheres. 9. The structure of the blastoderm. 10. Recapitulation, 

 n. The ovarian ovum. 12. The descent of the ovum along the oviduct. 

 13. The impregnation of the ovum. 14. Segmentation. 15. The formation of 

 the upper and lower layers. 



CHAPTER II. 



A BRIEF SUMMARY OP THE WHOLE HISTORY OP INCUBATION, pp. 2742. 



i. The embryo is formed in the area pellucida. -2. The epiblast, mesoblast, 

 and hypoblast. 3. The extension of the blastoderm over the yolk. 4. The 

 vascular area. 5. The head-fold and the other folds by means of which the 

 embryonic sac is formed. 6. The outward shape of the embryo. 7. The 

 formation of the neural tube and alimentary canal: somatopleure and splanch- 

 iiopleure. 8. The amnion. 9. The allantois. 



