Cell Wall Density of Dry Wood

Using a pyconometer and two silicone fluids with widely different viscosities, it was concluded that the density of the dry cell wall was essentially the same as that of the dry wood substance, 1.465 grams per cubic centimeter. The results showed that the fine structure of the cell wall was equally inaccessible to a low viscosity silicone, to a silicone 46,000 times more viscous, and to helium. This means that the small residual void structure in dry wood is equally inaccessible to all known nonswelling fluids. It refutes the recent contrary claims based on optical examination that the density of the cell wall differs from that of wood substance.

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