X THE STRUCTURE OF THE FOWL 



PAGE 



45. Section of Albumen-secreting Part of Oviduct 



showing the Opening of a Tubular Gland Facing 76 



46. Epithelium from Albumen - secreting Part of 



Oviduct showing Ciliated Columnar and 



Goblet Cells . . . . Facing 76 



47. Diagram of the Chief Arteries . . .82 



48. Diagram of Chief Veins . . . .84 



49. Brain seen from the Side . . . .91 



50. Section through the Eyeball . . . 99 



51. Section through Coats of the Eyeball at the 



Exit of the Optic Nerve, under Low Magnifica- 

 tion ..... Facing 76 



52. Diagram of the Parts of a Feather . .105 



53. Diagram of Three Stages in the Gro\\i:h of a 



Feather ..... Facing 108 



54. Surface View of the Blastoderm showing the 



Lines of Segmentation . . . .114 



55. Diagram of the Blastoderm within the Egg about 



the End of the First Day of Incubation . 117 



56. Primitive Streak and its Surroundings . .118 



57. Transverse Section through the Primitive 



Streak ..... Facing 108 



58. Transverse Section through the Neural Groove 



Facing 118 



59. Transverse Section of Embryo . . „ 118 



60. 61, 62. Diagrams of Transverse Sections of 



Blastoderm to illustrate Extension and 

 Splitting of Mesoderm . . . Facing 120 



63, 64. Diagrams of Transverse Sections to illustrate 

 the Separation of the Embryo from the rest 

 of the Blastoderm . . . Facing 120 



