traneous" hormones, (e) metabolic studies, (f) sensitivity of presumed target organ, (g) effects of removal of certain of the endocrines, (h) effect of hypophysectomy on target organs (related to subject "g"), and (i) graft studies. No student of experimental embryology should be denied the opportunity of reading Jost's essay. Finally, the essay by Greep on the interrelations of pituitary funct...