The Ten Books on Architecture, 2.9.4

Vitruvius  translated by Joseph Gwilt

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4That this should be the method pursued, will appear from the nature of shrubs. These, at the proper season, when pierced at the bottom, discharge from the heart through the holes made in them all the redundant and pernicious juices, and thus drying acquire strength and durability. On the contrary, when those juices do not escape, they congeal and render the tree defective and good for nothing. If, therefore, this process of draining them whilst in their growing state does not destroy their vigour, so much the more if the same rules are observed when they are about to be felled, will they last for a longer period when converted into timber for buildings.

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