nutrition or preservation of the spermogenetic function. He thinks “we run more risk of failure of the implant from the greater traumatization of the tissue necessary for anastomosis.” He thinks, too, that the spermogenetic epithelium of the testes degenerates in all cases rather promptly.[189] In his book, _Impotence, Sterility and Sex Gland Implantation_ (1917), which seems somewhat ill-digested, Lydston claims priority on eight points and formulates twenty-one conclusions. It seems to me that he has not sufficiently assimilated the best European work in this field or profited as much as he might have done by the far greater refinements of technique of Steinach; while such results as he claims are, as he himself admits, always wide open to criticism. * * * * * Serge Voronoff, like Metchnikoff, combines research with humanism and gives free rein to his idealism. He is professor in the medical school of the _Collège de France_ and deals with old age and death from the standpoint of endocrinology or the study of the glands of internal secretion. Accepting Weismann’s doctrine of the continuity of germ plasm, he says that the nameless and ever unassuaged horror that everybody really feels for death is “because an intimate memory of our immortality” survives or because we recollect creation’s first intention as expressed in plasmal immortality. Man has inherited this longing from the deathless unicellular creatures from which he descended not only in the form of quests for elixirs of life here but in all his manifold beliefs of a life beyond the grave, at the same time for this life accepting the gospel of renunciation to death as something inevitable. The ghastly thought of death not only clouds all our life but predisposes even most scientists to think that research in this field cannot be successful.