. Plant studies; an elementary botany. Botany. 10 PLANT STUDIES 14. Motile leaves.âThere are leaves, however, which have no hxed light position, bnt are so constructed that they can shift their position as the direction of tlie li^^ht clianges. Such leaves are not in the same position in tlie afternoon as in I lie forenoon, and tlieir night position may lie very diiferent fi-om either (see l-'igs. ".'. 'Aa. '.lb, 1). Some of the common lujuse jilants show tliis ]iower. In the ease of the com- mon the inght â â â, J .,. , ^^ , . ,, , liosition of tlie loaves Fig. 3a. The day positi
. Plant studies; an elementary botany. Botany. 10 PLANT STUDIES 14. Motile leaves.âThere are leaves, however, which have no hxed light position, bnt are so constructed that they can shift their position as the direction of tlie li^^ht clianges. Such leaves are not in the same position in tlie afternoon as in I lie forenoon, and tlieir night position may lie very diiferent fi-om either (see l-'igs. ".'. 'Aa. '.lb, 1). Some of the common lujuse jilants show tliis ]iower. In the ease of the com- mon the inght â â â, J .,. , ^^ , . ,, , liosition of tlie loaves Fig. 3a. The day position of the leaves of redhnd f (C'«ra»).âAfter Arthur. is romai'kalilv (lilTei'ent. from the position in liglit. If sucli a plant is exposed to tlie light in a window and the positions of the leaves noted, and then turned half way around, so as to bring the other side to the light, the leaves may he observed to adjust them- selves gradually to the changed light-relations. Compass plants.âA striking illustrati(,in of a special light jiosition is found in the so-callcil â â conijiass ]; The best known of these jilants is the rosin-wood of the })rairie I'egion. Growing in situations oxposeil lii intense liglit, the leaves are turned edgewise, the llnl faces Ijcing turned away from the intense rays of middav, and directed towards the rays of less intensity ; that is, those of. 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 Coulter, John Merle, 1851-1928. New York, D. Appleton and Company
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