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Where exactly did Wallace stated this hypothesis the first time? -- 85.178.253.20 ( talk) 20:39, 3 January 2010 (UTC) reply

Well as the article kind of clearly says the primary source would be Wallace's 1889 book Darwinism, though Wallace had touched on the idea of natural selection reinforcing hybrid sterility in some correspondance he had with Darwin in the 1860s. I think what you are asking for is perhaps a quote from the primary source. I will look for one. The full text of Darwinism is available online. Rusty Cashman ( talk) 06:50, 4 January 2010 (UTC) reply

Ok I added in Darwinism as a primary source. I didn't add a direct quote because Wallace's exposition is rather verbose and rambling, but the core concept, which is that in some cases natural selection will favor increasing infertility between closely related varieties because hybrid offspring will be less well adapted to particular conditions than pure offsptring of either of the varieties, is clearly there. Rusty Cashman ( talk) 07:23, 4 January 2010 (UTC) reply