PLATE 2 



EXPLANATION OF FIGURES 



3 Young oocytes in hen ovary (X 352), with follicles consisting of a single 

 layer of granulosa (g). Nests of lutear cells in the stroma nearby (l). 



4 Portion of last discharged follicle in hen with thickened theca interna(0 

 and granulosa (g) being sloughed off into the cavity. (X 40.) 



20 



