. The theory of horticulture : or, An attempt to explain the principal operations of gardening upon physiological principles . Horticulture; Plant physiology. 84 VITAL ACTIONS. some portion of the descending sap forces its way laterally belo-w the wound, out of the bark into the alburnum, using the latter as a means of communi- cating with the bark below the ring. Some curious experiments upon this subject were contrived by Mr. N. Niven {Gardener's Magazine, vol. xiv.) In one case, he di- 5 vested the stem of a tree of a deep ring of bark, and of the first twelve layers of wood below it {fig.
. The theory of horticulture : or, An attempt to explain the principal operations of gardening upon physiological principles . Horticulture; Plant physiology. 84 VITAL ACTIONS. some portion of the descending sap forces its way laterally belo-w the wound, out of the bark into the alburnum, using the latter as a means of communi- cating with the bark below the ring. Some curious experiments upon this subject were contrived by Mr. N. Niven {Gardener's Magazine, vol. xiv.) In one case, he di- 5 vested the stem of a tree of a deep ring of bark, and of the first twelve layers of wood below it {fig. 5.); ne- vertheless the tree continu- ed to live and be healthy. From the exposed surface of the wood no sap made its appearance, except from a cut which had been in- advertently made with the saw on one side, to the depth of, perhaps, five or six layers of Wood beyond the twelve actually remov- ed. From that cut a flow of sap took place, and continued to run during the whole of the season in which the operation was per- formed. In this case, the sap must have ascended exclusively by the alburnum.*. * [This is a possible ease; but the American, familiar with th? practice of girdling trees, (which is nothing more than ringing with the hatchet,) so common in the new settlements, well knows that it destroys vitality as certainly as cutting down the tree at once. It. 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 Lindley, John, 1799-1865; Downing, A. J. (Andrew Jackson), 1815-1852. New York : Wiley and Halsted
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Keywords: ., bookcentury1800, bookdecad, booksubjecthorticulture, bookyear1859
