In obtaining data regarding the rate of growth and the proportion of late wood the same procedure is followed as with large beams.
It is not only the proportion of late wood, but also its quality, that counts.
All of this is presumptive evidence that the principle defect of larch is a lack of adhesion between the early and the late wood.
Color brown to white, sometimes with reddish tinge to late wood.
This is particularly the case with thick-walled cells such as are found in late wood.
The width of ring, that is, the number per inch, is not nearly so important as the proportion of the late wood in the ring.
Pores in late wood, especially in the outer part of the annual ring, are joined by lines of wood parenchyma.
They are carefully weighed, measured, rate of growth and proportion of late wood determined, as in bending tests.
Usually odorless, not splintery, not resinous, with little contrast between early and late wood.
Change from early wood to late wood is gradual and the difference in density is not great.
|late wood |
The part of the wood in a growth ring of a tree that is produced later in the growing season. The cells of late wood are smaller and have thicker cell walls than those produced earlier in the season. Within a growth ring, the change of early wood to late wood is gradual, but each layer of early wood from the next growing season makes an abrupt contrast with the late wood before it, thus leading to the perception of rings. Compare early wood.