Type and Variability in the Annual Woodincrement of Acer Rubrum L.

TL;DRAbstract

In all temperate zones, at least, trees form annually one layer of wood, which appears on a cross-section of a tree as a ring, more or less clearly defined.The rate at which the diameter and the area of any cross-section of the tree increases, can therefore be easily ascertained by measuring the width of the rings.To obtain direct evidence as to the relation of the rate of wood formation to the nature of the habitat, and to obtain information on the value of a biometric study in differentiating such habitats, statistical work has been carried out during the past winter of 1907-8.The work was done in connection with an inquiry on the toxic properties of bogwater and bogsoils, the data of which, correlated with this and other studies, will be brought out elsewhere in another paper.The purpose of the article here briefed is to call attention to the fact that statistical methods first used by Galton and now applied by Pearson (7), Davenport (4), Shull (8), and others to the more complicate

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