This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 edition. Excerpt: ...Thus, the large burls or gnarls which appear on old Elms, especially near the bases of the lower great branches, are ...
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 edition. Excerpt: ...Thus, the large burls or gnarls which appear on old Elms, especially near the bases of the lower great branches, are composed of complexly contorted and twisted masses of wood, often beautifully grained when sectioned and polished. They are formed by areas of cambium, which, instead of keeping their places and parts in the regular fibro-vascular cylinder, proceed to grow profusely, and thus are thrown out into irregular folds. A less extreme case is found in Curly Birch, and in some other irregularly grained hardwoods highly valued in fancy carpentry. In A twin-fruit, of Mandarin (Drawn from a photo Fig. 147.--A typical Witches-Broom, caused by an iEcidium, a Fungus, on a branch of Fir. (From Kerner.) some cases such growths are apparently started by injurious strains, which would explain their frequency at the bases of great branches; and very likely they represent areas in which the growth-control mechanism has been ruptured by the strain. It is interesting to note that a close analogy exists between these burls and the troublesome tumors which form in the human body, for the latter also are formless growths resulting from continued operation of the growth energy of the tissues after the control stimuli have been inhibited, usually as result of some strain or other accident. Other burls, however, with various kinds of knotty growths, are started by presence of parasites, which also inhibit the usual control, presumably by chemical action. Of this nature is the remarkable "wooden flower," sold to tourists in tropical America (Fig. 148). It is nothing but a stem in which a parasite has inhibited the growth control over a limited area, leaving that part free to grow as it happens. Fig. 148.--A Wooden Flower, or Wooden Rose, on a...
Hardcover reprint of the original 1920 edition-beautifully bound in brown cloth covers featuring titles stamped in gold, 8vo-6x9". No adjustments have been made to the original text, giving readers the full antiquarian experience. For quality purposes, all text and images are printed as black and white. This item is printed on demand. Book Information: A Textbook Of Botany For Colleges. Ganong, William F. William Francis. Indiana: Repressed Publishing LLC, 2012. Original Publishing: A Textbook Of Botany For Colleges. Ganong, William F. William Francis. New York, Macmillan, 1920. Subject: Botany.
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