slow there would be ample time for the change to be effected by the survival of the best fitted in every generation". He saw that his theory supplanted the views of Lamarck and! the Vistages and annulled ev ery important difficulty with these theories21.Two days later he sent Darwin (leading naturalist of the time) a four-thousand word outline of his ideas entitled "On the Law Which has Regulated the Introduction". This was more than merely cause for Darwin's distress, for his work was so similar to Darwin's own that in some cases it parallelled Darwin's own phrasing, drawing on many of the same examples Darwin hit upon. Darwin was in despair over this, years of his own work seemed to go down the tube - but he felt he must publish Wallace's work. Darwin was persuaded by friends to include extracts of his own findings when he submitted Wallace's work On the Law Which Has Regulated the Introduction of New Species to the Linnaean Society in 1858, feeling doubly horrible because he felt this would be taking advantage of Wallace's position. Wallace never once gave the slightest impression of resentment or disagreement, even to the point of publishing a work of his own entitled Darwinism. This itself was his single greatest contrib!ution to the field: encoura ging Darwin to publish his extensive research on the issues they'd both developed22.He later published Contributions to the Theory of Natural Selection, comprising the fundamental explanation and understanding of the theory of evolution through natural selection. He also greatly developed the notion of natural barriers which served as isolation mechanisms, keeping apart not only species but also whole families of animals - he drew up a line ("Wallace's line") where the fauna and flora of southeast Asia were very distinct from those of Australasia23.HARDY-WEINBERG PRINCIPLEPrior to full recognition of Mendel's work in the early 1900's, development of quantitative models describing the ch...
