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2But, if the place be not thus fitted by nature, nor secure for ships in stormy weather, and there be no river there to prevent it, but on one side there is a proper shore, then on the other side, by means of building or heaps of stones, a projection is run out, and in this the enclosures of harbours are formed. Building in the sea is thus executed. That powder is procured, which is found in the country between Cumæ and the promontory of Minerva, and is mixed with the water in the proportion of two parts thereof to one of lime.
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