Lava is much used for paving-stones in the neighborhood of volcanic districts, where pozzolana (for cement) and pumice stone are also important. [Please select]
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CHAPTER VI POZZOLANA 1. [Please select]
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There is still a path on the banks of the Fosso della Cecchina, leading to the rear wall of the villa, _aversum villæ parietem_; and the hillsides are still honeycombed with pozzolana quarries, the _angustiæ cavernarum_ of Suetonius. [Please select]
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It was necessary to bore a hole in the rear wall of the villa, and while this was being done, Nero quenched his thirst from a pond of stagnant water, near the opening of the pozzolana quarries. [Please select]
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In 1880-82 a third and deeper network of galleries was excavated for the sake of extracting the pozzolana, the beds of which support the tufa and the catacombs excavated in it. [Please select]
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