. Lessons in botany. Botany. MOVEMENT IN PLANTS DUE TO IRRITABILITY. Ill slender than those grown in the light. Light then has a retard- ing influence on the elongation of the stem. 195. Influence of light on direction of growth.—While we are growing seed- lings, the pots or boxes., of some of them should be placed so that the plants will ' have a one- sided Mu- ni i n a tion. This oan be done by placing them near an open win- dow, in a room with a one-sided illumi- nation, or they may be placed in a box closed on all sides but one which is facing the window or light. In 12-24 hours, or even i
. Lessons in botany. Botany. MOVEMENT IN PLANTS DUE TO IRRITABILITY. Ill slender than those grown in the light. Light then has a retard- ing influence on the elongation of the stem. 195. Influence of light on direction of growth.—While we are growing seed- lings, the pots or boxes., of some of them should be placed so that the plants will ' have a one- sided Mu- ni i n a tion. This oan be done by placing them near an open win- dow, in a room with a one-sided illumi- nation, or they may be placed in a box closed on all sides but one which is facing the window or light. In 12-24 hours, or even in a much shorter time in some cases, the stems of the seedlings will be directed toward the source of light. This influence exerted by the rays of light is helioiropism, a turning influenced by the sun or sun- light. 196. Diaheliot- ropism.—Horizon- ;al leaves and ihoots are diahe- * ' ' ' Dark chamber with opening at one side to show heliotropism. iiageotropic. The <After Schieichert.) general direction which leaves assume under this influence is hat of placing them with the upper surface perpendicular to. 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 Atkinson, George Francis, 1854-1918. New York, H. Holt and company
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