ORGANS OF INTERNAL SECRETION 327 



activity (e.q. ovaries with prominent follicles like those from 

 animals " on heat," or ovaries with corpora lutea like those of 



c.l 



'.- 



FIG. 74. Section through rat's kidney, into the tissue of which an ovary 

 had been transplanted. (From Marshall and Jolly, Quart. Jour, of 

 Experimental Physiology.) 



ar, artery; c.l., corpus luteum ; g.f. , Graafian follicle; yl., glomerulus of 

 kidney; ov.st., ovarian stroma ; r.t., renal tubule; z.".t., zone of 

 granulation tissue between ovarian tissue and tissue of kidney. 



