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The old sealer, however, is not surprised at their indifference, guessing its cause. He knows that in the weird forests of Tierra del Fuego there is many a tree standing, to all appearance sound in trunk, branches, everything, yet rotten from bark to heartwood, and ready to topple over at the slightest touch, even if but a gun be rested against it.
It has a dark sweet-scented heartwood, like that of the Bricklow and the Myal and other Acacias, which I had previously met with. The creek turned to the north and north-east, into a plain, and joined a larger creek which came in from the right at about south-west. Near their junction, a very conspicuous peak was observed, with several small water-holes with water at its foot.
Heartwood does not occur in all varieties of trees. In some cases, where both heartwood and sapwood appear, it is difficult to distinguish between them as their colors are so nearly alike. Because it takes up so much moisture and plant food, sapwood rots much more quickly than heartwood. The sapwood really acts as a pipe line to carry water from the roots to the top of the tree.
Heaven have mercy on us!" Nearly all the larger trees in the Fuegian forests have the heartwood decayed, and are worthless as timber. Out of fifteen cut down by Captain King's surveying party, near Port Famine, more than half proved to be rotten at the heart. The Micropterus brachypterus of Quoy and Guimard.
No household is to represent merely itself; one or two, or more, from one family are to bring always one or two, or more, from somewhere else. I am going to try if one little bit of social life cannot be exogenous; and if it can, what the branching-out will come to. I think we want sapwood as well as heartwood to keep us green. If anybody doesn't quite understand, refer to 'How Plants Grow Gray."
A potential saving of at least 20 per cent. of the timbers used for building purposes is promised, which means a salvage of about $40,000,000 annually as a result of strength tests of southern yellow pine and Douglas fir. Additional tests have shown that the red heartwood of hickory is just as strong and serviceable as the white sap wood.
The hardwood trees are unable to protect their wounds as effectively as the evergreens. Where the wound is large, the exposed sapwood dies, dries out, and cracks. The fungi enter these cracks and work their way to the heartwood. Many of the fungi cannot live unless they reach the heartwood of the tree.
The wood of the red cedar gives off a peculiar odor which is said to keep moths away from clothes stored in cedar chests, but it is the close construction of the chest which keeps them out. These trees are becoming scarce in all parts of the country. Cedars generally are small trees that grow slowly and live a long time. The outside wood is white and the heartwood is red or yellow.
As one strolls in the woods about the logging camps, most of the lumbermen are found to be interesting people to meet, kind and obliging and sincere, full of knowledge concerning the bark and sapwood and heartwood of the trees they cut, and how to fell them without unnecessary breakage, on ground where they may be most advantageously sawed into logs and loaded for removal.
When such accident occurs there will always be in the old trunk a region through which sap once went to this limb. This region, deprived of its function, goes completely dry, like the heartwood of the tree, and it is into such material as this that the woodpecker succeeds in drilling his well-protected home.
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