One reason why so many classifications have come into use is that none of them is quite accurate. A better one will be explained later. See [p. 23].
As in the study of all woods three sections are made, it is well at the outset to understand clearly what these are.
The sections of a tree made for its study are (Fig. 3):
(1) Transverse, a plane at right angles to the organic axis.
(2) Radial, a longitudinal plane, including the organic axis.
Fig. 3.
| A. | B. |
| A, B, C, D, Transverse Section. B, D, E, F, Radial Section. G, H, I, J, Tangential Section. | A, B, C, Transverse Section. A, B, D, E, Radial Section. B, C, E, F, Tangential Section. |
(3) Tangential, a longitudinal plane not including the organic axis.