Diagram reproductive organs of laying hen. 

 I, Ovary, with minute ovules; 2, yolk sacs; 3, suture lines; 5, empty 

 yolk sac; 6, funnel opening into oviduct; 8, yolk in oviduct; 9, albumen- 

 secreting region; 10, the same; 11, albumen being secreted; 12, yolk passing 

 through oviduct; 13, germinal disc; 14, uterus; 15, large intestine; 16, 

 isthmus; 17, glands of uterus; 18, complete egg; 19, vagina; 20, cloaca; 21', 

 egg shell; 22, albumen; 23, yolk; 24, chalaza. 



