Naturalist (1815-1854) who proposed that the distributions of montane plants and animals had been compressed downslope, and some oceanic islands connected to the mainland, during the recent ice age. This mechanism, which was the first natural explanation of the distributions of the same species on now-isolated islands and mountain tops, was discovered independently by Charles Darwin, who credited Forbes with the idea. ANS, one page, 3 x 4.5, no date. Handwritten note by Forbes to a colleague, in full: "Allow me to introduce a friend who is desirous of seeing the Museum in King's College." In fine condition.
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