Fig. 28. — Photomicrographs of the ovaries of Httermate rats, 26 days old. X 19 

 (also see fig. 29). Top: ovary of normal rat. Weight of both ovaries, 17.1 mg. 

 Body-weight, 57 g. Middle: ovary of rat receiving a total dose of 2 mg. of an ex- 

 tract of human whole pituitary. 0.5 mg. of the extract was given once daily for 

 4 days (21-24 days). Weight of both ovaries, 79.8 mg. Body-weight, 55 g. Bot- 

 tom: ovary of rat receiving a total dose of 6 mg. of an extract of human pituitary. 

 1.5 mg. was given once daily for 4 days (21-24 days). Weight of both ovaries, 150.5 

 mg. Body-weight, 54 g. 



