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In order that the mortar in the joints may not suffer from frosts, drench it with oil-dregs every year before winter begins. Thus treated, it will not let the hoarfrost enter it.

Marcus Vitruvius Pollio
Winter, Order, Years
"De architectura (Ten Books on Architecture)". Book by Marcus Vitruvius Pollio (Book VII, Chapter I, Section 6), circa 15 BC.
In order that the mortar in the joints may not suffer from frosts, drench it with oil-dregs every year before winter begins. Thus treated, it will not let the hoarfrost enter it.