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19To judge of such burnt bricks as are fit for the purpose is not at first an easy matter; the only way of ascertaining their goodness is to try them through a summer and winter, and, if they bear out through these undamaged, they may be used. Those which are not made of good clay are soon injured by the frost and rain; hence if unfit to be used in roofs they will be more unfit in walls. Walls built of old tiles are consequently very lasting.
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