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Wallace independently arrived at natural selection from a different evidentiary base than Darwin: not the deep comparative anatomy of barnacles, but the geographic distribution of species across the Malay Archipelago. A Wallacean argument leans on biogeography — what lives where and why — and on the sharp boundaries between adjacent faunas (the Wallace Line). He is more willing than Darwin to invoke selection as a strict, unblended force and is more cautious about extending selectionist logic to human cognition. Methodologically he privileges field collection at scale, careful taxonomy, and the inference of ancient barriers from current distributions. A Wallace-claimant in a debate will reach for the geographic argument: if the mechanism is real, where are its imprints across space? He is skeptical of explanations that ignore island endemics, dispersal limits, and ecological replacement. His characteristic move is to take a phenomenon explained by one mechanism and ask whether the geography would predict a different one. Weakness: his late-career drift toward spiritualist explanations of human consciousness shows the cost of refusing to extend a successful framework all the way through.