82 



INTERNAL SECRETION 



who could not adopt this theory. There is no need to enumerate 

 the authors who have held one or the other view on this ques- 

 tion. There is a tendency towards a compromise in some of 

 the recent papers. Thus, van der Stricht found that, whereas 

 the majority of the luteal cells are derived from the follicular 

 epithelium, a certain number are developed out of interstitial 



FIG. 13. Section through the ovary of Dasyurus viverrinus, showing Graafian 

 follicles and corpus luteum. (Drawn by Mrs. F. D. Thompson from 

 material supplied by Prof. Charles O'Donoghue.) 



( ( IU in the inner theca of the connective-tissue sheath. As 

 pointed out by Marshall, this is of special interest in view of 

 the statement made by Miss Lane-Claypon that the follicle 

 and interstitial cells have an identical origin, since both are 

 d ii\rd limn the germinal epithelium, and pass through a 

 similar si-rirs of changes. The majority of recent investigators 



