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[140] For the above facts: Pfeffer, _Pflanzen-Physiologie_, vol. 2, pp. 423-8; Green, _Vegetable Physiology_, p. 389; Kerner, _l.c._, p. 697; Bonnier, _l.c._, p. 305.
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[140] For the above facts: Pfeffer, _Pflanzen-Physiologie_, vol. 2, pp. 423-8; Green, _Vegetable Physiology_, p. 389; Kerner, _l.c._, p. 697; Bonnier, _l.c._, p. 305.