Age and area; a study in geographical distribution and origin of species . 0 2 4 -6 -8 10 1-2 14 16 18 20 22 24 log (N9 of species) Logarithm curve for all Flowering Plants (from Willis, Dictionary).(By courtesy of the Editor of Nature.) That this is in fact very close to the actual truth when con-siderable numbers are dealt with is shown by the figures onpp. 241, 242, which give the logarithmic curves for all floweringplants, for the Rubiaceae, and for the Chrysomelid beetles. Thissubject must also be left for further consideration in a later it to say for the present that the ev
Age and area; a study in geographical distribution and origin of species . 0 2 4 -6 -8 10 1-2 14 16 18 20 22 24 log (N9 of species) Logarithm curve for all Flowering Plants (from Willis, Dictionary).(By courtesy of the Editor of Nature.) That this is in fact very close to the actual truth when con-siderable numbers are dealt with is shown by the figures onpp. 241, 242, which give the logarithmic curves for all floweringplants, for the Rubiaceae, and for the Chrysomelid beetles. Thissubject must also be left for further consideration in a later it to say for the present that the evidence is decidedly infavour of the origin of new species and genera from old bymutation, which in the long run has followed a very definite 1 For this deduction I am indebted to my friend Mr G. Udny Yule,, 16 242 GEOGRAPHICAL DISTRIBUTION [pt. ii N2 of species 10 30 ioo. • 2 -4 6 -8 10 1-2 1-4 16 18 2 log (N? of species) Logarithm curve for Rubiaceae (from Willis, Dictionary). (By courtesy of the Editor of Nature.)
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