——­ ——­ ——­ letter to F. Bates, on exotic insect-collecting, i. 69

——­ ——­ ——­ letters to H.W.  Bates: 
  on Darwin’s Journal, i. 25;
  on “Law regulating Introduction of New Species” and Ternate,
    65;
  congratulating him on arriving home, 72;
  on Darwin, 73

——­ ——­ ——­ letters to Mr. F. Birch: 
  on “Mars,” ii. 177;
  announcing conferment of Order of Merit, 223-4

——­ ——­ ——­ letter to Mr. H. Jamyn Brooke, on monism, ii. 177

——­ ——­ ——­ letters to Miss Buckley (Mrs. Fisher): 
  on “Descent of Man,” ii. 31-2;
  on physiology of ferns, etc., 40-1;
  on infinity of life-forms, 89-90;
  on house-planning at Broadstone, 119-20;
  on Turks, 153;
  on his “Reciprocity” article, 153;
  on the earth as only habitable planet, 175;
  on Spiritualism, 188-95;
  on psychical and other works, 203-4;
  on his visit to Switzerland, 204;
  on re-incarnation and theosophical writings, 205;
  on psychical research and Spencer’s “Autobiography,” 211;
  on conferment of Order of Merit, 222;
  on his autobiography, and Owen, 224-5;
  on reviews of “My Life,” 225-6

——­ ——­ ——­ letter to Mr. Sydney C. Cockerell, on Kropotkin’s Life,
    ii. 161

——­ ——­ ——­ letter to Mr. Theo.  D.A.  Cockerell, on fertilisation,
    ii. 49

——­ ——­ ——­ letters to Charles Darwin: 
  on the Timor honeycomb, i. 143;
  on Darwin’s “Orchids,” 143;
  on theory of flight, 145;
  on Spencer’s “Social Statics,” 150;
  on Borneo exploration and his contribution to theory of man’s origin,
    152;
  on his paper on Man and Natural Selection, 155;
  on the Aru Islands, 161;
  on a case of variation becoming hereditary, 162;
  on the Reader, 165;
  on dimorphism, 168;
  suggesting “survival of the fittest” in preference to “natural
     selection,” 170;
  on mimicry and glacier action, 176;
  on expression, 180;
  on “Creation by Law,” 188, 192;
  on superintendency of a Museum, 193;
  on sterility of hybrids, 196;
  on natural selection as producing sterility of hybrids, and pangenesis,
    199;
  on Trimen’s paper at the Linnean Society, 201;
  on selective sterility, 203, 205, 210;
  on Darwin’s “Cross Unions of Dimorphic Plants,” 218;
  on protection and sexual selection, 221, 222, 227;
  on the dedication of “Malayan Travels,” etc., 232;
  on single variations, 234;
  on colouring of caterpillars, 235;
  on his “unscientific” opinions on Man, 243, 250, 255;
  on wing-scales of butterflies, 244;
  on Dr. Meyer, 248;
  on “Descent of Man,” 255, 259, 284;
  recommending two remarkable books, 263;
  on Mivart and Chauncey Wright’s critique, 265;
  on Darwin’s answer to Mivart, 271;
  on Dr. Bree, and Bastian’s “Beginnings of Life,” 273;
  on a Bethnal Green Museum appointment,