. The power of movement in plants . Plants; Botany. Chap. IIL OP THE BADICLE OF THE PEA. 161 these radicles are either less strongly acted on by geotropism, or, what is more probable, are more sen- sitive to contact. After a time geotropism always prevailed, but its action was often delayed; and in tiiree instances there was a most curious struggle between geotropism and the irritation caused by the cards. Four of the 13 radicles were a little curved downwards within G or 8 h., always reckoning from the time when the squares were first attached, and after 23 h. three of them pointed vertically
. The power of movement in plants . Plants; Botany. Chap. IIL OP THE BADICLE OF THE PEA. 161 these radicles are either less strongly acted on by geotropism, or, what is more probable, are more sen- sitive to contact. After a time geotropism always prevailed, but its action was often delayed; and in tiiree instances there was a most curious struggle between geotropism and the irritation caused by the cards. Four of the 13 radicles were a little curved downwards within G or 8 h., always reckoning from the time when the squares were first attached, and after 23 h. three of them pointed vertically down- wards, and the fourth at an angle of 45° beneath the horizon. These four radicles therefore did not seem Fig. 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 Darwin, Charles, 1809-1882; Darwin, Francis, Sir, 1848-1925. New York : D. Appleton
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Keywords: ., bookcentury1800, booksubjectbotany, booksubjectplants, bookyear18
