Lunatics, distinctions between feeble-minded and, 274-276 laws relating to feeble-minded and, need for improvement in, 275 Lyell, Sir Charles, Darwin and Wallace papers communicated to Linnean Society by, 12, 13 Malaria, comparative death-rate from, in Panama Canal zone, 2-4 measures adopted in Cuba and Panama for prevention of, 2, 3 Mammoth age, 380, 386 Man, sleep of, compared with repose or quiescence of other living things, 159-161 Mankind, congenital defects in, causes of, 273 Mental defect, 274 Metchnikoff, Professor, discoveries with regard to use and value of “phagocytes,” 39 experiment by, in connection with cholera-bacillus, 241 experiments and investigations of, for prevention of “senile change,” 40-43 influence of Darwin’s discoveries upon study of disease by, 39, 40 researches of, with regard to microbian flora of localities, 249 Russian and French representative at Darwin Centenary Celebration, 33, 38 Tolstoi’s meeting with, 43, 44 use of sour milk prepared with lactic ferment introduced by, 41, 42 _Micrographia_ (Hook), 173, 289 Microscopes, improvements in, 173, 176-178 Milton, celebration of tercentenary of birth, Halley’s comet in relation to, 228 Halley and, scholars of St. Paul’s School, 228, 229 Mistletoe, pre-historic rites associated with, 362 Mollusca, animals classed as, and definition of word, 129 Molluscs, protection of young, 137-139, 144, 146 Mongolian wild horses, 86 Morley, Lord, installation of, as Chancellor of Manchester University, 6 Morphia, product of opium poppy, 363 Moths, British species allied to Mexican “jumper,” 300, 301 clothes, mischief effected by caterpillar of, 341-343 movable case made by caterpillar of, 341-343 propagation of, 341 various species of, 343-345 Mexican “jumper,” 300, 301 silk threads produced by caterpillars of certain, 293 Mountain-climbing, use of oxygen gas in, suggested, 263 Moustierian period, definition of, 384, 385, 408 skulls and skeletons found in cave-deposits allotted to, 371, 385, 393-395, 406, 408 Mussels, pond and river, propagation of, 144, 145 protection of young, 144 Mycenæ, discovery of, by Schliemann, 16 Neander men, comparison between skulls of Australian aborigines and, 396, 397 inferiority of, as compared with Cromagnards, 390 reasons for recognition of, as distinct and primitive species, 371, 385, 390, 402-403, 407 Neolithic Period, civilisation comprised in, 377-378, 380 definition of, 377 Nettles, poisonous stinging hairs of, 103, 104 Newton, Sir Isaac, discovery of law of gravitation, 230 Halley and, friendship of, 230