248 Diseases of Poultry 



5. An empty follicle in which the stigma has opened and 

 the yolk passed out. 



6. Anterior end of the margin of the funnel (or infundibu- 

 lum) of the oviduct or egg-tube. When an ovule is about to 

 be discharged from the ovary these funnel lips or margins 

 wrap around that portion of the ovary, so that the ovule 

 may certainly pass into the oviduct and not into the ab- 

 dominal cavity. 



7. Opening of the funnel. Through this opening the 

 yolk passes into the oviduct. 



8. A yolk which has just passed through the funnel 

 opening into the upper portion of the oviduct. 



9. 9. Albumen secreting portion of the oviduct in which 

 the greater portion of the albumen or white of the egg is 

 secreted by glands in the walls of the oviduct in this region. 



10. First layer of albumen, or white, secreted about the 

 yolk. From this layer are formed the chalazce, or cords of 

 twisted, thickened albumen, at each pole of the yolk. 



11. Yolk, around which albumen is being secreted. 



12. The germinal disk. This is the living portion of the 

 egg, from which the future chick develops, the main mass of 

 yolk serving as food material for the developing embryo 

 during the process. 



13. Anterior end of the isthmus of the oviduct. The 

 primary function of the isthmus is to secrete about the egg 

 the shell membrane, the dense white membrane closely ad- 

 herent to the inside of the shell of an egg. 



14. The uterus, or shell gland, in which the shell is put on 

 the egg. 



15. The rectum. 



16. The walls of the abdomen cut and folded back. 



17. External opening of the cloaca, or common space into 

 which open (a) the rectum, (6) the oviduct and (e) the 

 ureters, or kidney ducts. 



