. Physiological botany; I. Outlines of the histology of phænogamous plants. II. Vegetable physiology. Plant physiology; Plant anatomy. 394 VEGETABLE GROWTH. accompanying figure shows an easj- method of demonstrating this mode of governing the direction of growing 1032. Thermotropism. As might be expected from what has been said regarding the tensions of tissues and the facilitj- with which their balance is disturbed, the effect of warmth in govern- ing the direction of a growing organ must be considerable. Cur- vatures dependent upon temperature are called thermotropic. 1033. Assumptio
. Physiological botany; I. Outlines of the histology of phænogamous plants. II. Vegetable physiology. Plant physiology; Plant anatomy. 394 VEGETABLE GROWTH. accompanying figure shows an easj- method of demonstrating this mode of governing the direction of growing 1032. Thermotropism. As might be expected from what has been said regarding the tensions of tissues and the facilitj- with which their balance is disturbed, the effect of warmth in govern- ing the direction of a growing organ must be considerable. Cur- vatures dependent upon temperature are called thermotropic. 1033. Assumption of definite form during growth depends, of course, chieflj' upon inherited tendencies ; but there have been experiments which show that to a slight extent it may be pos- sible hy external influences to induce special shapes of growing structures. Among the most interesting of these are the experi- ments by Pfeflfer' upon the growth of bilateral organs in some of the lower plants, especially Marchantia; by De Vries ^ upon 1 Arbeiten des bot. Inst, in Wilrzburg, 1871, p. 77. 2 Arbeiten des bot. Inst, in Wiii-zburg, 1872, p. 223. Pig. 174 Eontsof seedlings affected by moisture daring their descent. The ap- paratus consists of a network frame filled with moist sawdust in which the seedlings germinate. (Sachs.). 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 Goodale, George L. (George Lincoln), 1839-1923. New York [etc. ] : American Book Co.
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