THE FEMALE REPRODUCTIVE ORGANS 



17 



entire for examination with great ease, a fact which makes this 

 animal invaluable for experimental work. The mammary 





Fig. 10. — Udder of Cow; stained to show Mammary Tissue. 



(From Hammond). 



gland differs from the other accessory organs in being differen- 

 tiated at a much later stage of development and also in being 

 rudimentary when puberty is reached. 



P.S.O. 



