. Plant studies; an elementary botany. Botany. FOLIAGE LEAVES: THE LIGHT-RELATION 13. Fig. 6. These plants are growing near a windoiv. It will tje noticed tliat the stems bend strongly towards the light, and that the leaves face the liL'ht. of tlie most obvious relations of foliage leaves to light, and that the important part Ti'hieh heliotru^iism plavs. not only in connection with foliage leaves, bnt tilso in connection with other plant organs, is one of the most important and extensive sxibjects of plant pliysiologv. RELATION- OF LEAVES TO OXE AXOTHEI: A. On erect stems In view of what has b
. Plant studies; an elementary botany. Botany. FOLIAGE LEAVES: THE LIGHT-RELATION 13. Fig. 6. These plants are growing near a windoiv. It will tje noticed tliat the stems bend strongly towards the light, and that the leaves face the liL'ht. of tlie most obvious relations of foliage leaves to light, and that the important part Ti'hieh heliotru^iism plavs. not only in connection with foliage leaves, bnt tilso in connection with other plant organs, is one of the most important and extensive sxibjects of plant pliysiologv. RELATION- OF LEAVES TO OXE AXOTHEI: A. On erect stems In view of what has been said, it would seem that the position of foliage leaves on the stem, and their rehition to one another, must be determined to some extent by the necessity of a favoralde light-relation. It is apparent that the conditions of the jOToblem are not the same for tin erect as for a horizontal stem. 17. Relation of breadth to number of vertical rows.— Uf)on an erect stem it is observed that tlie leaves are usu-. 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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