. The care of trees in lawn, street and park. With a list of trees and shrubs for decorative use. Trees; Trees. CHAPTER III DISEASE AND DEATH OF TREES—GENERALI- TIES OR normal development trees require, as we have seen, light, heat, water, air, and nutritive ele- ments in certain amounts. If any of these conditions or elements are temporarily deficient (or sometimes when in excess) the normal functions are interfered with, and the tree may be ailing, although not necessarily sick, for it ma}^ recover its normal condition as soon as the deficiency is corrected. We speak of disease only when li\
. The care of trees in lawn, street and park. With a list of trees and shrubs for decorative use. Trees; Trees. CHAPTER III DISEASE AND DEATH OF TREES—GENERALI- TIES OR normal development trees require, as we have seen, light, heat, water, air, and nutritive ele- ments in certain amounts. If any of these conditions or elements are temporarily deficient (or sometimes when in excess) the normal functions are interfered with, and the tree may be ailing, although not necessarily sick, for it ma}^ recover its normal condition as soon as the deficiency is corrected. We speak of disease only when li\'e parts fail to perform their normal functions and begin to die before their time, that is to say, when buds, rootlets, or cambium die at any time, and lea^'es change color, become dry, and fall before the end of the season. Since, as we have seen, the li\ing parts of the tree lying on its periphery rejuvenate themselves every year by the formation of new shoots, buds, cambium and rootlets, there can be actually no natural death from old age in the same sense as in animals. Even death from internal causes as a direct result of disease, at least sudden death, is rare. Trees die mostly as a result of unfa\'orable external con- ditions, whicli interfere with tlieir nutrition, and which are generally capable of control. As a rule, they succumb so gradually that they actually die by inches; it may take many years before all fife is gone, and hence there is time for recuperative measures. 29. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Fernow, B. E. (Bernhard Eduard), 1851-1923. New York Holt
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