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Chap. I. the poorer classes, thus justifies the greed of the rich and the selfishness of the powerful, will spread quickly and strike its roots deep. This has been the case with the theory advanced by Malthus.

And of late years the Malthusian theory has received new support in the rapid change of ideas as to the origin of man and the genesis of species. That Buckle was right in saying that the promulgation of the Malthusian theory marked an epoch in the history of speculative thought could, it seems to me, be easily shown; yet to trace its influence in the higher domains of philosophy (of which Buckle's own work is an example) would, though extremely interesting, carry us beyond the scope of this investigation. But how much be reflex and how much original, the support which is given to the Malthusian theory by the new philosophy of development, now rapidly spreading in every direction, must be noted in any estimate of the sources from which this theory derives its present strength. As in political economy, the support received from the doctrine of wages and the doctrine of rent combined to raise the Malthusian theory to the rank of a central truth, so the extension of similar ideas to the development of life in all its forms has the effect of giving it a still higher and more impregnable position. Agassiz, who, to the day of his death, was a strenuous opponent of the new philosophy, spoke of Darwinism as "Malthus all over," and Darwin himself says the struggle for existence "is the doctrine of Malthus applied with manifold force to the whole animal and vegetable kingdoms."

It does not, however, seem to me exactly correct to say that the theory of development by natural selection or survival of the fittest, is extended Malthusianism, for the doctrine of Malthus did not originally and does not necessarily involve the idea of progression. But this was soon added to it. McCulloch attributes to the "principle of 5