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6First, the fir, containing a considerable quantity of air and fire, and very little water and earth, being constituted of such light elements, is not heavy: hence bound together by its natural hardness it does not easily bend, but keeps its shape in framing. The objection to fir is, that it contains so much heat as to generate and nourish the worm which is very destructive to it. It is moreover very inflammable, because its open pores are so quickly penetrated by fire, that it yields a great flame.
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