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Hysteria and degeneration have always existed; but they formerly showed themselves sporadically, and had no importance in the life of the whole community. It was only the vast fatigue which was experienced by the generation on which the multitudes of discoveries and innovations burst abruptly, imposing on it organic exigencies greatly surpassing its strength, which created favourable conditions under which these maladies could gain ground enormously, and become a danger to civilization.
