Introduction
It must be one of the tasks of sociological and historical investigation first to analyse all the influences and causal relationships which can satisfactorily be explained in terms of reactions to environmental conditions. Only then, and when comparative racial neurology and psychology shall have progressed beyond their present and in many ways very promising beginnings, can we hope for even the probability of a satisfactory answer to that problem.[12] In the meantime that condition seems to me not to exist, and an appeal to heredity would therefore involve a premature renunciation of the possibility of knowledge attainable now, and would shift the problem to factors (at present) still unknown.
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