CHAP, i.] FEMALE ORGANS. 359 



growth, and the whole corpus luteum becomes a large and striking 

 object; in sections of an ovary taken at a time when a corpus 

 luteum succeeding pregnancy is at its maximum of growth, a large 

 part, of the whole bulk of the ovary will sometimes be seen to be 

 taken up by it. In all cases the corpus luteum of pregnancy 

 lasts a much longer time, passing more slowly through its several 

 phases, especially those of degeneration, than does that of an un- 

 impregnated ovum; this difference is much more constant than 

 that of mere size. 



