History repeats itself. The march of progress is onward, ever onward, but it moves in cycles. A center of civilization springs up, flourishes for a time then decays; and from the ashes of the perished civilization, phœnix-like, there springs a larger, grander, more enduring civilization. Nowhere in the cycle of progress is this more noticeable than in the history of sanitation. Centers of civilization, like Jerusalem, Athens, Rome and Carthage, arose to pre-eminence in sanitary matters, built sewers, constructed aqueducts and provided for the inhabitants magnificent baths the equal of which the world has never since seen. After the splendors of Carthage and Rome, darkness succeeded; a darkness from which we slowly emerged in the sixteenth century and are now speeding on to eclipse the sanitary splendors of even the old Roman empire. In its broadest sense, a history of sanitation is a story of the world's struggle for an adequate supply of wholesome water, and its efforts to dispose of the resultant sewage without menace to health nor offence to the sense of sight or smell. In ancient as in modern times, water was the chief consideration of a community. Centers of population sprung up in localities where water was plentiful, and where for commercial, strategetic or other reasons, a city was built remote from a water course, great expenditures of labor and treasure were made constructing works to conduct water to the city from distant springs, lakes or water courses. Ruins—still standing—of some of those engineering works give us some idea of the magnitude of the water supply for ancient cities belonging to the Roman empire. [Illustration: Rebekah at the Well] In the early days of primitive man, sanitation was among his least concerns. He obtained water from the most convenient source, and disposed of his sewage in the least laborious way. Those who lived in the vicinity of streams solved the problem by moving to the bank, where, like their more highly civilized descendants of to-day, they drew water from the up side of the stream and returned the sewage to the water to pollute and possibly contaminate it for their neighbors lower down. Communities living remote from natural water courses soon learned the value of wells as a source of water supply. Many mentions of wells are made in the Book of Genesis, and it is affirmed by Blackstone that at that period wells were the cause of violent and frequent contention; that the exclusive property or title to a well appeared to be vested in the first digger or occupant, even in such places where the ground and herbage remained in common.