Historians agree that all known civilizations, empire after empire, republic after republic, from the dawn of recorded time down to the present age, have decayed and died, through causes generated by civilization itself. In each such case the current of human progress has been restored by a fresh influx of savage peoples from beyond the frontiers of civilization. So it was with Assyria, Egypt and Persia; so Greece became the wellspring of art and the graces of life, and then died out; so Rome conquered the world, built up a marvellous structure of law, and then died out. As Edward Carpenter and others have shown us, history can paint pictures of many races that have attained the luxuries and seeming securities of civilization, but history has yet to record for us the tale of a nation passing safely through civilization, of a nation which has not been eventually destroyed by the civilization it so arduously won. And why? Because when ancient races emerged out of barbarism into civilization, they changed all the habits of living of the human race. They adopted new customs of eating; they clothed themselves; they lived under roofs; they came together in towns; they devised ways of avoiding exposure to the sun and wind and rain—but they never succeeded in devising ways of living that would keep them in health in their new environment. The old struggle against the forces of nature once relaxed, men grew effeminate and women weak; diseases increased; physical fibre softened and atrophied and withered away; moral fibre went the same path to destruction; dry rot attacked the foundations of society, and eventually the whole fabric toppled over, or was swept aside, to be built up again by some conquering horde of barbarians, which in its turn grew civilized, and in its turn succumbed to the virulent poison that seemed inherent in the very nature of civilization, and for which there seemed to be no antidote. So much for the past. As to the present, there do not lack learned and authoritative observers and thinkers who declare that our own civilization is also dying out. They point out that while in many directions we have bettered our physical condition, improved our surroundings, and stamped out many virulent diseases (smallpox, the plague and yellow fever, for instance), and have reduced average mortality, nevertheless we have but exchanged one set of evils for another and perhaps more serious, because more debilitating and degenerating set: namely, those manifold and race-destroying evils known as nervous troubles, and those other evils resulting from malnutrition, which are lumped together vaguely under the name of dyspepsia, or indigestion—the peculiar curse of America, the land of the frying-pan.