A handwritten letter from Charles Darwin to an unnamed recipient (possibly botanist Hewett Cottrell Watson) in 1856, asking if he believes a plant with adjacent male and female reproductive organs can be fertilized by another, and stating interest in Thomas Andrew Knight's view that all plants occasionally cross-fertilize, sold for $26,400.Labels: autographs, Charles Darwin, John Milton, Letters, Marco Tomaschett, Paradise Lost, record prices, top lots