. On the relation of phyllotaxis to mechanical laws. Phyllotaxis; Leaves. THE BILATERALITY OF APPENDAGES. 293 In dealing with such a phenomenon it is necessary, to begin with, to distinguish between facts of observation and any inter-. Fig. 100.—Geometrical construction, including progressive " dorsiventrality " and sliding-growth effect for system (8 + 13). Drawn with construction curve (Type II.) for uniformly retarded growth. ' / ^ pretations which may have been ascribed to them. Now the facts observable are very definite: the rhomboidal primordia apparently thrust laterally along

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. On the relation of phyllotaxis to mechanical laws. Phyllotaxis; Leaves. THE BILATERALITY OF APPENDAGES. 293 In dealing with such a phenomenon it is necessary, to begin with, to distinguish between facts of observation and any inter-. Fig. 100.—Geometrical construction, including progressive " dorsiventrality " and sliding-growth effect for system (8 + 13). Drawn with construction curve (Type II.) for uniformly retarded growth. ' / ^ pretations which may have been ascribed to them. Now the facts observable are very definite: the rhomboidal primordia apparently thrust laterally along their tangential diagonal, and as. 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 work.. Church, A. H. (Arthur Harry), 1865-1937; Church, Arthur Henry, Notes on phyllotaxis. London, Williams & Norgate