. The causes and course of organic evolution; . eguminosse—are exceptionally valuable for our present illustrations of stimulation and resultant response alikefor stems and leaves we may select the sensitive plant (Mimosapudica), since compounding or separation of response arequickly performed in it or in its ally M. Spegazzini. Photo-illustration 8 a, is taken from a pot-plant that grew in a stovehouse ^^dth bright diffuse illumination. The stem thereforeshows compounded or resultant apogeotropic and heliotropicposition response. The leaves are placed transversely or arediageotropic,
. The causes and course of organic evolution; . eguminosse—are exceptionally valuable for our present illustrations of stimulation and resultant response alikefor stems and leaves we may select the sensitive plant (Mimosapudica), since compounding or separation of response arequickly performed in it or in its ally M. Spegazzini. Photo-illustration 8 a, is taken from a pot-plant that grew in a stovehouse ^^dth bright diffuse illumination. The stem thereforeshows compounded or resultant apogeotropic and heliotropicposition response. The leaves are placed transversely or arediageotropic, and all, whether on the stem side toward theincident light or on that away from it, are so tilted at varyingangles that the incident rays fall at right angles to the we may say that these are diaheliotropic. But, if a plantbe inverted, the leaves inside an hour or two have undergonea striking angular rearrangement. But, for our present pur-pose Fig. 8, b that was made two days after inversion, but other- Law of Proenvironment 219. meS CO 3 CO o o • S c3 c . -op- Si. o00 A C5 ^^ c300
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