A signed Charles Darwin letter with autograph postscript to St. George Mivar defending theory of Natural Selection, dated 1871 sold for £76,800 ($103,770) at Sotheby’s-London Books, Mss and objects from 3 important collections on April 17. Reported by Rare Book Hub. This is an excerpt from the catalog notes AN IMPORTANT LETTER IN WHICH DARWIN DEFENDS NATURAL SELECTION AGAINST ONE OF HIS MOST ACUTE AND PERSISTANT CRITICS. St George Mivart (1827–1900) was a noted natural scientist who had enjoyed the support of both Owen and Huxley in the 1860s, but he was also a prominent figure in Britain's Roman Catholic community. On the Genesis of Species (1871) expanded on a series of articles entitled "Difficulties of the theory of natural selection" that had been published in 1869. In this letter Darwin identifies a number of points at which Mivart has misunderstood or misquoted him and asserts his continued belief in the explanatory power of natural selection.…