THE STRUCTURE OF FREE-MARTIN GONADS 



67 



Or sc -r—^. 



Fig. 1- Diagrammatic reconstructions to show a jaormal testis, and an indif- 

 ferent stage of an ovary, which under normal conditions differentiates into an 

 ovary (shown in two stages), but under the influence of male sex hormones may 

 form gonads which exhibit three stages of transformation in the male direction. 



2 I am indebted to Mr. Kenji Toda for valuable assistance in the preparation 

 of the drawings. 



