III. THE CORPUS LUTEUM AND OTHER 

 FOLLICULAR DERIVATIVES IN VERTEBRATES 



§ I . THE STRUCTURE OF THE OVARY 



In our search for the gland which we believe to be responsible 

 for the growth of the ovipositor, we directed our attention 

 in the first place to the ovary. We then found corpus luteum- 



luteogen/c egg 



ovarywall 



young egg 



medium-' 

 sized egg 

 corpus luteum 

 \ or stage 



corp tut ^5r'' \^ 



y''^^ corplut fi-stage 



Fig. 6 1. Transverse section through the ovary of Rhodeus amarus. 



Apart from small, medium-sized and large eggs, all stages in the 



formation of corpus luteum are seen. 



