规定了两种选择用于测定强度和刚度特性的试样木材密度的方法，这两种方法同样适用。假设木材密度呈正态分布，变异系数约为0.15，且密度只是影响接缝强度的特性之一。其他相关属性，如生长环大小和晶粒坡度，不包括在内。

Two methods for the selection of the density of wood for specimens to be used in determining strength and stiffness properties are specified, which are equally applicable. It is assumed that the wood density is normally distributed with a coefficient of variation of about 0.15 and that the density is only one of the properties influencing the strength of a joint. The other relevant properties, e.g. growth ring size and slope of grain, are not included.