Within the last half century the whole community had been gradually awakening to the importance of a knowledge of the laws of health, and the energies of some of the ablest intellects in the world had been employed in investigating the causes of disease, and in endeavoring to solve the problem of the prevention of disease. There was much that was still obscure in this very intricate problem, but the new light which was daily being thrown upon the causes of disease by the careful and exact researches of the chemist and physiologist was gradually tending to explain those causes and to raise the science of hygiene, or science of prevention of disease, out of the region of speculation, and enable it to take rank as one of the exact sciences. Long ago the careful observation of facts had shown that the preservation of health required certain conditions to be observed in and around dwellings, conditions which, when neglected, had led to the outbreaks of epidemic disease from the days of Moses to the present time.

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