. Heredity and evolution in plants . h readilyaccount for the exceptions and apparent discrepanciesthat here and there occur. And again, this law agrees 1 Endemic: found in a given region, but not elsewhere. 2 Lam, H. J. The verbenaceae of the Malayan Archipelago. Gronin-gen, 1919. 3 Including, for example, all the native Hawaiian palms, belonging to thegenus Pritchardia. See MacCaughey, Vaughan. Bull. Torrey , 45: 259-277. July, 1918, and Plant World 21:317-328. Dec., 1918. 4 Wallace, Alfred Russel. On the law which has regulated the introduc-tion of new species. Annals and Mag. of Na
. Heredity and evolution in plants . h readilyaccount for the exceptions and apparent discrepanciesthat here and there occur. And again, this law agrees 1 Endemic: found in a given region, but not elsewhere. 2 Lam, H. J. The verbenaceae of the Malayan Archipelago. Gronin-gen, 1919. 3 Including, for example, all the native Hawaiian palms, belonging to thegenus Pritchardia. See MacCaughey, Vaughan. Bull. Torrey , 45: 259-277. July, 1918, and Plant World 21:317-328. Dec., 1918. 4 Wallace, Alfred Russel. On the law which has regulated the introduc-tion of new species. Annals and Mag. of Nat. Hist. 16, : 1855. I 00 HEREDITY AN7D EVOLUTION IN PLANTS with, explains and illustrates all the facts connected withthe following branches of the subject: ist, the system ofnatural affinities; 2d, the distribution of animals andplants in space; 3d, the same in time . . 4th, thephenomena of rudimentary organs. And Wallace goeson to show, in detail the bearing of the law upon each ofthe four points FIG. 76.—Alfred Russel Wallace (1823-1913). Co-discoverer, withDarwin, of the principle of natural selection. Noted student of geo-phical distribution. A quotation from Darwin is also pertinent here: Itis ... obvious, said Darwin, that the individuals ofthe same species, though now inhabiting distant andisolated regions, must have proceeded from one spot, wheretheir parents were first produced for, as has been explained,it is incredible that individuals identically the same shouldhave been produced from parents specifically distinct. 121. Mutation and Discontinuous Distribution.—Read-ing Darwins statement in the light of the mutation theory GEOGRAPHICAL DISTRIBUTION 167 of de Vries, we must of course recognize that, if a mutatingspecies were widely distributed, different individuals of thespecies in widely separated localities and even with a dis-continuous distribution, might throw the same Lamarckiana, for example, threw the s
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