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 become recruiting grounds for the labor required in the gold and diamond mines of the Rand, Rhodesia, and Kimberley; for this purpose, the population is demoralized, taxed, driven into revolt, and exposed to the contamination of European vice and disease. Healthy and vigorous races from Southern Europe are tempted to America, where sweating and slum life reduce their vitality if they do not actually cause their death. What damage is done to our own urban populations by the conditions under which they live, we all know. And what is true of the human riches of the world is no less true of the physical resources. The mines, forests, and wheat-fields of the world are all being exploited at a rate which must practically exhaust them at no distant date. On the side of material production, the world is living too fast; in a kind of delirium, almost all the