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Davy, Sir Humphry The advance in years brings indifference, and at the same time strength and steadiness. The young sapling is moved by every breeze; shoots forth its leaves vigorously when favoured by dew and sunshine; but is often severely injured, if not destroyed, by frost. In the mature tree, as the heartwood is covered by many coatings of sapwood, it becomes compressed and harder; but though it loses its vitality, it contributes to the strength of the vegetable.