. The elements of forestry : designed to afford information concerning the planting and care of forest trees for ornament or profit and giving suggestions upon the creation and care of woodlands with the view of securing the greatest benefit for the longest time, particularly adapted to the wants and conditions of the United States. Forests and forestry. Structure of Wood. 69 245. In many kinds of the " hard-woods," and especially in the oak,-ash, elm, etc., each annual layer is more spongy and porous on the inner side, and harder on the outer side. The former is some- times called t
. The elements of forestry : designed to afford information concerning the planting and care of forest trees for ornament or profit and giving suggestions upon the creation and care of woodlands with the view of securing the greatest benefit for the longest time, particularly adapted to the wants and conditions of the United States. Forests and forestry. Structure of Wood. 69 245. In many kinds of the " hard-woods," and especially in the oak,-ash, elm, etc., each annual layer is more spongy and porous on the inner side, and harder on the outer side. The former is some- times called the spring and the latter the autumnal growth. This autumnal growth is, however, formed in the summer, and its dens- ity and relative thickness appears to depend upon the character of the season that follows after it has been deposited. If it remains humid and cold, it will be less dense than if it be dry and warm. The amount of growth for the year is usually determined by the weather in the spring and early summer. 246. In exceptional cases, such as an early and protracted drouth, followed by heavy rains and a warm autumn, a second growth may start; the buds may expand into leaves, and blossoms may appear. In such cases, it is possible for a double ring of growth to form, but it will not be entirely distinct in every part. Such an autumn, if it is followed by a cold winter, is yery apt to prove fatal to trees, or at least to check their growth for a time, if it does not destroy them. 247. In tropical woods, the annual layers are obscure, the age of a tree can not ascertained from them. 248. In the soft-woods, there is scarcely any difference be- tween the lavers, and tlie sepa-^- section of Mahogany, showing indistinct ' r Layers of Growth in a Tropical Wood, ration between the growth of different years is sometimes difficult to find. 249. Deciduous trees, when stripped of their leaves, as sometimes occurs from insect ravages, will put forth a new crop, from "the buds inte
Size: 2868px × 871px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectforestsandforestry
