PLATE 9 
EXPLANATION OF FIGURES 
30 Section of an ovarian part of gonad of 1349, showing stroma (X 80). 
31 Section of gonad of a guinea chicken hybrid, showing that organ is com- 
posed entirely of stroma (X 176). 
32 Section of ovary of a just-hatched chick (x 40). c, part composed of sex 
cords; e, germinal epithelium. mm is mesonephros. 
46 
