,.. i 



Fig. 36.17. Reproductive organs of the hen. (After Duval.) The organs fully 

 develop only on the left side; those of the right are rudimentary. Two eggs are 

 shown in the oviduct at different levels; normally but one is in the oviduct at one 

 time. 1, ovary showing many young follicles each containing an egg; 2 and 3, suc- 

 cessively larger follicles containing the enlarging eggs; the dark lines are blood 

 vessels in the walls of the follicular sacs; the white band, 4, is the line where the 

 follicular sac breaks and releases the egg; 5, empty follicular sac; 6 and 7, lip and 

 funnel of the oviduct; 8, egg in the upper part of the oviduct; 9, region of the 

 oviduct in which the albumen is secreted; 10, the oviduct cut open to show the 

 albumen surrounding {11) the egg; 12, the germinal disk where the chicken be- 



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