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Rh best elements of the population in each generation failed to reproduce themselves, and that the least vigorous were, as a rule, those to whom the continuance of the race was due. One might be tempted to suppose that civilization, when it has reached a certain height, becomes unstable, and tends to decay through some inherent weakness, some failure to adapt the life of instinct to the intense mental life of a period of high culture. But such vague theories have always something glib and superstitious which makes them worthless as scientific explanations or as guides to action. It is not by a literary formula, but by detailed and complex thought, that a true solution is to be found.

Let us first be clear as to what we desire. There is no importance in an increasing population; on the contrary, if the population of Europe were stationary, it would be much easier to promote economic reform and to avoid war. What is regrettable at present is not the decline of the birth-rate in itself, but the fact that the decline is greatest in the best elements of the population. There is reason, however, to fear in the future three bad results: first, an absolute decline in the numbers of English, French, and Germans; secondly, as a consequence of this