Book reviewed in this article:The Conception of Disease: its History, its Versions and its Nature. By WaltherRiese, M.D.‘A Genetic and Neuropsychiatric Investigation of a North‐Swedish Population with special regard to Schizophrenia and Mental Deficiency’. By J. A. Böök. Acta Oenetica et Statistica Medica, vol. 4, pp. 1–100, 133‐9 and 345–414. Basel: S. Karger.*The Facts of Life. By C. D. DarlingtonLife and other Contingencies. Vol. I. By P. F. Hooker, F.I.A., A.S.A. and L. H. Longley‐Cook, M.A., F.I.A., F.C.A.S., A.S.A. Published for the Institute of Actuaries and the Facu