Architectural variety and solidity are favoured in the buildings of the city by a wealth of beautiful building stones of varied colours (limestones, sandstones, lavas, granites and marbles), in addition to which bricks and Roman tiles are employed. [Please select]
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It is to these materials that the name of "lavas" is properly applied. [Please select]
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Lavas present a general resemblance to the slags and clinkers which are formed in our furnaces and brick-kilns, and consist, like them, of various stony substances which have been more or less perfectly fused. [Please select]
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East of the river is a flat plain or valley of adobelike soil a few miles wide beyond which extends a rough area of dark lavas. [Please select]
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