Abstract
A brief survey of some of the problems of human genetics of which increasing exposure to ionizing radiation is only one. The kind of data necessary to an intelligent evaluation of the problem will not issue from the investigations of a few scattered geneticists but will require a greatly expanded effort on both human and nonhuman material, involving many teams of highly trained personnel. The problems call for an order of magnitude of research effort far in excess of what in the past, in the field of biology, has seemed adequate.