reading, 103;
visits Maer and Shrewsbury, 103;
experiments, 103;
Huxley and, 104;
at work on Species and Varieties, 107;
at Down, 109;
receives presentation copy of Spencer's Essays, 124;
appreciation of Wallace's magnanimity, 134, 137, 139, 141, 153,
164, 242, 252, 287, 304;
falls from his horse, 243;
on Wallace's review of "Descent of Man," 260-2;
criticism of Wallace's "Geographical Distribution," 286, 289;
at Dorking, 288;
promotes memorial to City Corporation in favour of Wallace, 303;
acknowledgment of "Island Life," 307-8;
on migration of plants, 307 (note), 312;
memorial to Gladstone on behalf of Wallace, 313;
death of, 318

Darwin, Charles, letters to Wallace:
On "Law regulating Introduction of New Species," etc., i. 106, ii. 129;
on distribution of animals, i. 133;
on his "Origin of Species," etc., 134, 136;
on Wallace's "Zoological Geography of the Malay Archipelago," 137;
inviting Wallace's opinion of the "Origin," 139;
on protective adaptation of butterflies, 140;
on Press reviews of "Origin," 141, 144;
on theory of flight, 146;
on Wallace as reviewer, 148;
on Wallace's "Variation" and his paper on Man, 153;
on sexual selection, 159;
on Wallace's papers on pigeons and parrots, 160;
on the Aru pig, 162;
on the crested blackbird, etc., 163;
on Wallace's "Pigeons of Malay Archipelago" and dimorphism, 166;
on the non-blending of varieties, 169;
on the term "survival of the fittest," 174;
on sexual differences in fishes, 177;
on colour of caterpillars, 178;
on coloration and expression in man, 179;
on sexual selection and expression, 182;
on scheme for his work on Man, 183;
on laws of inheritance, etc., 185;
on Wallace's "Mimicry," 187;
on Wallace's reply to Duke of Argyll, 189;
on sexual selection and collateral points, 194;
on pangenesis and sterility of hybrids, 197;
on production of natural hybrids, etc., 201;
on sexual selection, 204, 206, 207;
on northern alpine flora, 211;
on Wallace's article on "Birds' Nests," and on mimetic butterflies, 212;
on Sir Clifford Allbutt's sperm-cell theory, and on female protected
butterflies, 214;
on Wallace's "Protective Resemblance," 216;
on dimorphic plants and colour protection, 220;
on the colour problem of birds, 225, 229, 231;
on fifth edition of "Origin of Species," 233;
on single variations, 234;
on Wallace's "Malay Archipelago,"