The eggs of mammals eggsofmammals00pinc Year: 1936 THE GROWTH OF THE OVUM 35 follicles do develop to the stage of antrum formation. The absence of eosinophile cells in the pituitaries of dwarf mice may, however, indicate the absence of a necessary link in the chain of steps involved in the hypophysis-gonad relationship. Whatever the effect of ovarian maturation upon the pi- tuitary may be, it is plain that no follicular response to pitui- tary hormones occurs until the time when full sized ova are present. Does this mean that the maturation of the follicle 120 iioH 100 ^.90 ^ 80 ^ 70 O 60 H
The eggs of mammals eggsofmammals00pinc Year: 1936 THE GROWTH OF THE OVUM 35 follicles do develop to the stage of antrum formation. The absence of eosinophile cells in the pituitaries of dwarf mice may, however, indicate the absence of a necessary link in the chain of steps involved in the hypophysis-gonad relationship. Whatever the effect of ovarian maturation upon the pi- tuitary may be, it is plain that no follicular response to pitui- tary hormones occurs until the time when full sized ova are present. Does this mean that the maturation of the follicle 120 iioH 100 ^.90 ^ 80 ^ 70 O 60 H 50 H S ^ 30 (a). / (b) . OBSERVATIONS X CALCULATED POINTS 100 200 300 400 500 600 700 800 900 1000 DIAMETER OF FOLLICLE, (jl. Fig. 9. Same as Fig. 8. Data on the ferret. (From the Proceedings of the Royal Society.) is dependent initially upon some influence of the ovum, or is the simultaneous development of the ovum to full size and follicular growth to stimulable size a coincidence only? The ovum may grow to full size without an investiture of follicle cells as attested by the frequent presence of such ova in the ovaries of dwarf mice (Pincus, unpublished data). On the other hand, anovular follicles do occur in mammalian ovaries (League and Hartman, 1925) though those of large size represent follicles with completely resorbed ova (Engle, 19276). It is interesting to note also that frequent produc- tion of anovular follicles from the germinal epithelium takes place in senile rats (Hargitt, 1930).
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