BY DOUGLAS DEWAR, B.A. (Cantab), I.C.S., F.Z.S. AND FRANK FINN, B.A. (Oxon), F.Z.S., M.B.O.U. WITH FIFTEEN ILLUSTRATIONS Post-Darwinian books on evolution fall naturally into four classes. I. Those which preach Wallaceism, as, for example, Wallace’s _Darwinism_, Poulton’s _Essays on Evolution_, and the voluminous works of Weismann. II. Those advocating Lamarckism. Cope’s _Factors of Evolution_ and the writings of Haeckel belong to this class. III. The writings of De Vries, forming a group by themselves. They advocate the theory that species spring suddenly into being; that new species arise by mutations from pre-existing species. IV. The large number of books of a more judicial nature, book…
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