. Plant life, considered with special references to form and function. Plant physiology. THE MOVEMENT'S OF PLANTS. 207 298. Contact movements.—Some organs are sensitive to contact, as the leaves of Venus' fly-trap and other related plants. The motor organ in the Venus' fly-trap (figs. 386, 205) is the cushion of tissue running along the dorsal side of the leaf between the two lobes. By the sudden variation in. Fig. 204.—PhoteoUc movements, a^ leaf of a mimosa in day position ; a\ tlie same in night position, b, leaf of Coronilla z/aria in day position ; ^', tlie same in nigtlt po- sition, c, l
. Plant life, considered with special references to form and function. Plant physiology. THE MOVEMENT'S OF PLANTS. 207 298. Contact movements.—Some organs are sensitive to contact, as the leaves of Venus' fly-trap and other related plants. The motor organ in the Venus' fly-trap (figs. 386, 205) is the cushion of tissue running along the dorsal side of the leaf between the two lobes. By the sudden variation in. Fig. 204.—PhoteoUc movements, a^ leaf of a mimosa in day position ; a\ tlie same in night position, b, leaf of Coronilla z/aria in day position ; ^', tlie same in nigtlt po- sition, c, leaf of A jnorpha/ri/ticosa in day position ; c', tlie same in night position. (/, leaf of Tetra^onoLobiLs in day position ; d', same in night position.—After Kerner. turgor of some of these cells the two halves of the leaf are thrown quickly together when one of the six bristles upon its upper surface is touched. The sensitive plant drops one of its leaflets or the whole leaf quickly when stimulated by con- tact, heat, or electricity. The position of the leaves when. 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 Barnes, Charles Reid, 1858-1910. New York, H. Holt & company
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