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15The walls being shaped, the earth in the middle is to be thrown out as low as the foot of the walls, and when levelled, the bottom is to be covered with the same materials to the requisite thickness. If these receptacles are made in two or three divisions, so that the water may be passed from one to another, it will be more wholesome for use; for the mud in it will be thus allowed to subside, and the water will be clearer, preserve its flavor, and be free from smell; otherwise it will be necessary to use salt for purifying it. In this book I have explained to my utmost ability the virtues and varieties of waters, their use and conveyance, and how their goodness may be ascertained; in the following book I intend to describe the principles of gnomonics and the rules of dialling.
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