immigrant and of racial intermarriage, loom upon us. But since we have no applicable science whatever here, since there is no certainty in any direction that any collective course may not be collectively evil rather than good, there is nothing for it, I hold, but to leave these things to individual experiment, and to concentrate our efforts where there is a clearer hope of effective consequence. Leave things to individual initiative and some of us will, by luck or inspiration, go right; take public action on an insufficient basis of knowledge and there is a clear prospect of collective error. The imminence of these questions argues for nothing except prompt and vigorous research.]
That, however, is only one aspect of this question. There are others from which the New Republican may also approach this problem of the quality of the birth supply.
In relation to personal conduct all these things assume another colour altogether. Let us be clear upon that point. The state, the community, may only act upon certainties, but the essential fact in individual life is experiment. Individuality is experiment. While in matters of public regulation and control it is wiser not to act at all than to act upon theories and uncertainties; while the State may very well wait for a generation or half a dozen generations until knowledge comes up to these—at present—insoluble problems, the private life must go on now, and go upon probabilities where certainties fail. When we do not know what is indisputably