{179a} Professor Huxley, Encycl. Brit., 9th ed., art. Evolution, p. 750. {179b} “Hume,” by Professor Huxley, p. 45. {180} “The Philosophy of Crayfishes,” by the Right Rev. the Lord Bishop of Carlisle. _Nineteenth Century_ for October 1880, p. 636. {181a} Les Amours des Plantes, p. 360. Paris, 1800. {181b} Philosophie Zoologique, tom. i. p. 231. Ed. M. Martin. Paris, 1873. {182a} Journal of the Proceedings of the Linnean Society. Williams & Norgate, 1858, p. 61. {182b} Contributions to the Theory of Natural Selection, 2d ed., 1871, p. 41. {182c} Origin of Species, p. 1, ed. 1872. {183a} Origin of Species, 6th ed., p. 206. I ought in fairness to Mr. Darwin to say that he does not hold the error to be quite as serious as he once did. It is now “a serious error” only; in 1859 it was “the most serious error.”—Origin of Species, 1st ed., p. 209. {183b} Origin of Species, 1st ed., p. 242; 6th ed., p. 233. {184a} I never could find what these particular points were. {184b} Isidore Geoffroy, Hist. Nat. Gen., tom. ii. p. 407, 1859. {184c} M. Martin’s edition of the “Philosophie Zoologique” (Paris, 1873), Introduction, p. vi. {184d} Encyclopædia Britannica, 9th ed., p. 750.