PLATE 1 



EXPLANATION OP FIGURES 



8 Transection of ovary, fetal kitten, 95 mm. (no. 5); rete ovarii, medullary 

 cords (occupying central portion), egg cords, are shown. The 'synizetic wave' 

 occupies approximately the middle of the zone of egg cords. Photograph. X 35. 



9 Longisection of ovary, kitten 3 to 4 days, P. P. (no. 11). The position of 

 the rete in the cephalic portion (at the right) is illustrated. There are shown 

 the branched egg cords occupying the primitive cortex and extending down into 

 the epithelio-stromal zone, the basal connective tissue nucleus. Medullary cords 

 (in the epithelio-stromal zone) are not shown at this magnification. Photograph. 

 X 15. 



10 Transection of ovary, kitten 14 days, P. P. (no. 20). The zones of the 

 ovary appear more definite. Medullary follicles beginning. Photograph. X 20. 



11 Transection of ovary, kitten, Ca. 4 weeks (no. 22). The medullary fol- 

 licles developing. In the primitive cortex, the primary follicles are forming. 

 Photograph. X 20. 



12 Transection of ovary, kitten, 5 to 6 weeks (no. 24). The peculiar medul- 

 lary follicles whose development is illustrated in figures 16 to 25 are here shown 

 developing. The cortical egg cords are now dissolved into primary follicles, 

 the primitive cortex becoming the definitive cortex. Photograph. X 15. 



13 Transection of ovary, kitten, 3 months (no. 35). The irregular, pluri- 

 ovular medullary follicles are now large. Their irregularity and pluri-ovular 

 character are indicated. Compare figures 31 and 32. The cortex is occupied by 

 primary follicles. Two sections of rete ovarii are shown in the center. Photo- 

 graph. X 12. 



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