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The various drainage-pipes from different parts of the villa were so led into this trap-room that their lower ends were always under water, so that no exhalations could ever pass up any of them. To the bottom of the trap settled the solid matter and sediment from the drainage-water.
Now the minor tower, in which was the spiral stair, was built as a vent to carry up into the air, far above the roofs of the villa, any miasma, effluvium or exhalation from the drainage-water of the villa's baths, kitchen and latrines.
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