272 



INDEX 



Idioplasm, 99 



Inheritance of acquired char- 

 acters (see Acquired char- 

 acters) 



Intelligence and evolution, 2S3 



Intercrossing, checked by isola- 

 tion, 75 



Internal secretions, 109, 113 



Intercellular pangenesis, 93 



Island faunas, 81 



Isolation in evolution, 73-91; 

 r61e of, 75-80; and differenti- 

 ation, 198 



James, W., leader of American 

 psychology, 10; quoted, 234 



JoBDAK, Davto Stahe, address 

 by, 71-91 



Kallima, 177 



Karyokinetic division and he- 

 redity, 103, 104 

 KiNGSXET, C, quoted, 16 

 KoLHEUTEB, hybridism, 52 

 KowAiJivsKY, 300, 215 



Lamabck, 215, 249; debt to 

 Erasmus Darwin, 10; hy- 

 pothesis, 34, 35; adaptation, 

 193, 204 



Lane-Clatpole, effect of fetus 

 extract, 107 



Lan KESTEB, E. Rat, quoted, 39 ; 

 "homoplasy," 240 



Leaf-butterfly, 177 



Leidt, J., 232; fossil record, 9; 

 correspondence with Darwin, 

 309 



Lepidoptera, experiments upon, 

 123 



Linnean Society, meeting for 

 Natural Selection papers, 18 



Lizards, 200 



LoTST, J. P., 166 



Lyeu, Chables, influence on 

 Darwin, 13, 13, 29; presents 

 the papers of Darwin and 

 Wallace, 18, 19; prevents 

 Dawson's review, 31; letter 

 of Darwin to, 45; coral reefs, 

 46 



MacDottoai,, D. T., chemical 

 treatment of germ-cells, 110; 

 address by, 114 



MacGregor, experiments, 128 



Malthus, influence on Darwin, 

 11 



Mammals, fossil, 313 



Mammary glands, stimulated by 

 fetus extract, 107 



Marsh, O. C, 9, 315, 318, 232 



Matthews, 213 



Maturation, 103 



May beetles, 167 



Memory in heredity, 41, 113 



Mendel, G., 145 



Mendelism, 10, 144, 242; and 

 pangenesis, 40; and heredity, 

 100, 108, 153, 153 



Metabolic activities, irritable re- 

 actions, 117 



Mill, J. S., opinion of Origin, 

 33, 23 



Mitotic division in heredity, 

 103 



MivAET, St. George, opposition 

 to Darwin, 31-33 



MooEE, AuBBEY, quoted, 17 



MoBGAK, Lloyd, organic selec- 

 tion, 10, 48 



MuLLEB, Fritz, defense of Dar- 

 win, 8; letter of Darwin to, 39 



Murray, Andrew, crude theory 

 of, 24 



Mutation, 303; bearing on pan- 

 genesis, 40; Darwin's views 

 on, 43-46; origin. 111; ad- 

 dress on, 160-181; and adap- 

 tation, 194 



Myrmecophiles, 63 



Nageli, theory of evolution, 35 ; 

 idioplasm, 144, 146; adapta- 

 tion, 193 



Natural selection, 206; theory 

 of, 10; discovery of, 11; pecu- 

 liarities of, 14; opponents of, 

 24; claimed by Owen, 31; in 

 relation to mutation, 47; to 

 hybridism, 53; to botany, 67- 

 71; implies segregation, 85; 

 not opposed to isolation 

 theory, 89; and mutation, 

 176; and adaptation, 193, 196 



Neo-Darwinism, 161-163 



