ABSTRACT
The density of a piece of timber is a function not only of the amount of wood substance present, but also the presence of both extractives and moisture. In a few timbers extractives are completely absent, whereas in many they are present, but only in small amounts and usually less than 3% of the dry mass of the timber. In some exceptional cases, the extractive content may be as high as 10% and in these cases it is necessary to remove the extractives prior to the determination of density.
