. The causes and course of organic evolution; . , fails to alter its average constitution. On this]>rinciple, therefore, every species of plant or animal showsa mobile or elastic adaptibility, that is at times as strikingas it is unexpected. It is this adaptibility, also, wliich enablesit, when in the egg state, to fuse with a complemental sperm Active Causes of Organic Evolution 185 nucleus from another species or even genus of plant or animal,and so to build up a dual organism that may, as the writerhas demonstrated (63 fassiin), either blend exactly all of theparental peculiarities, or e
. The causes and course of organic evolution; . , fails to alter its average constitution. On this]>rinciple, therefore, every species of plant or animal showsa mobile or elastic adaptibility, that is at times as strikingas it is unexpected. It is this adaptibility, also, wliich enablesit, when in the egg state, to fuse with a complemental sperm Active Causes of Organic Evolution 185 nucleus from another species or even genus of plant or animal,and so to build up a dual organism that may, as the writerhas demonstrated (63 fassiin), either blend exactly all of theparental peculiarities, or exhibit these as distinct morphologicalstructures side by ^ide with each other, as in the accompanyingillustrations, where the large honey gland of one parent speciesof liliaceous plant, Lapageria (Fig. 2, a, b, and c), is entirelyabsent in the allied genus Philesia, but is reproduced of abouthalf size in the hybrid genus Philageria, developed undercultivation. The writer has cited or illustrated various simi-lar cases amongst flowering
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