Gray, Asa, Darwin’s Correspondence with, 51, 55, 107, 181, 184; his Influence upon, 112; Darwin’s Controversy with, 114–118 Gray, Dr., 146, 149 Henslow, Prof., Friendship with Darwin, 18–21 Herbert, J. M., on Darwin’s Character, 19, 20 Hereditary Genius, Evidences in the Darwin Family, 10, 11 Heredity, Theories of, 167, 174 Hermaphroditism, 175 Holmes, Dr. Oliver Wendell, his References to Darwin, 9; his Correction of Darwin, 9 Hooker, Sir Joseph, 37, 48; Darwin’s Letters to, on Species-mongers, 39–40; Darwin’s Opinion of, 48; Friendship and Correspondence with Darwin, 50; Lyell’s Correspondence with, as to Specific Centres, 57; Darwin’s Influence upon, 110, _et seq._; awarded the Copley Medal of the Royal Society, 111; and Darwin, 146; Darwin Writing on Pangenesis, 181, 182 Huxley, Prof., Criticisms of Darwin’s Theory, 46, 48; on Teleology, 113; Darwin’s Influence upon, 119–143; agrees with Darwin on Evolution, 121; Views on Natural Selection, 121, 124, 126, 138; Article in the _Times_ on the Origin of Species, 124; his Article in the _Westminster Review_, 125; Lectures on the Causes of the Phenomena of Organic Nature, 128, 142; Views as to Natural Selection not changed, 137, 138; Speech at the British Association Meeting at Oxford, 139; awarded the Darwin Medal of the Royal Society, 140; Darwinism, not Evolution, 140, 141; and the Bishop of Oxford, 155 Hybrid Grafts, 166 Hybridism, 175, 176 Hybrids, Tendency to Resemble one Parent, 171; Sterility of, 171; Produced by Grafting, 168 Hypothesis and Speculation, Bearing on Science, 14, 15 Inheritance, The Theories of, 167, 174 Insectivorous Plants, 198 Instinctive Knowledge in Animals denied by Darwin, 216 Jenkin, Fleming, 81 Lamarck’s Theory of Evolution, 99; Comparison with Darwin’s, 148, 150 Lankester, Prof. E. Ray, 99, 184 Linnean Society, Joint Memoirs by Darwin and Wallace, read before, 65, _et seq._ Lowe, Robert, 150 Lyell, Sir Charles, Influence on Darwin, 29, 30, 51; and Continental Extensions, 53; and Hooker’s Agreement on the Specific Centres Theory, 57; Darwin’s Appeal to, on the Natural Selection, 97; Influence of Darwin upon, 105; Accepts Darwin’s Views, 108, 109; Death of, 109; Darwin’s Letter on Pangenesis, 181 Lythrum, Different Forms of Flowers on the, 195 Macleay, W. S., 150 Malthus on Population, its Influence on Darwin, 46; and on Wallace, 88, 89 Man, The Descent of, 186 Meldola, Prof., on Systematic Work, 37; and Darwin, 199, _et seq._ Metamorphosis, 171 Mimetic Resemblance, 202 Mimicry, 202, 204; Bates’ Theory, 212; Fritz Müller’s Theory, 212; Dixey’s paper on, 214 Müller, Fritz, Darwin’s Letters to, 181, 183; on Mimicry, 212–214; his Paper Translated, 213 Murray, Andrew, 152