48"0 



INDEX 



Baker, Mr. J. G., on rarity of spiny- 

 plants in Mauritius, 432 

 Ball, Mr., on cause of late appearance 



of exogens, 400 

 Barber, Mrs. , on variable colouring of 

 pupse of Papilio nireus, 197 

 on protective colours of African 

 sun-birds, 200 

 Barbs, 91 

 Barriers, importance of, in questions 



of distribution, 341 

 Bates, Mr. H. W., on varieties of 

 butterflies, 44 

 on inedibility of Heliconidee, 



234 

 on a conspicuous caterpillar, 



236 

 on mimicry, 240, 243, 249 

 Bathmism or growth-force, Cope on, 



421 

 Beddard, Mr. F. E., variations of 

 earth-worms, 67 

 on plumes of bird of paradise, 

 292 

 Beech trees, aggressive in Denmark, 



21 

 Beetle and wasp (figs.), 259 

 Beetle, fossil in coal measures of 



Silesia, 404 

 Beginnings of important organs, 128 

 Belt, Mr., on leaf-like locust, 203 

 on birds avoiding Heliconidag, 

 234 

 Belt's frog, 266 

 Birds, rate of increase of, 25 

 how destroyed, 26 

 variation among, 49 

 variation of markings of, 52 

 variation of wings and tails of, 



53 

 diagram showing variation of 



tarsus and toes, 60 

 use of structural peculiarities 



of, 135 

 eggs, coloration of, 212 

 recognition marks of, 222 

 and butterflies, white in tropical 



islands, 230 

 sometimes seize inedible butter- 

 flies, 255 

 mimicry among, 263 



Birds, sexual coloration of, 275 



cause of dull colour of female, 



277 

 choice of female not known to 

 be determined by colour, etc., 

 285 

 decorative plumage of, 285 

 antics of uuornamented, 287 

 which fertilise flowers, 319 

 colours of, not dependent on the 



colours of flowers, 336 

 no proof of aesthetic tastes in, 



336 

 dispersal of, 355 

 and insects at sea, 357 

 of oceanic islands, 358 

 carrying seeds on their feet, 



361 

 ancestral forms of, 407 

 Birthplace, probable, of man, 459 

 Bombyx regia, protective form of 



larva of, 210 

 Boyd Dawkins, on development of 

 deer's horns, 389 

 on origin of man, 456 

 Brady, Mr. George, on protective 



colouring of star-fishes, 209 

 Brain development, progressive, 390 

 Brains of man and apes, 452 

 Branner, Mr. J. C, on supposed 

 proofs of glaciation in Brazil, 

 370 

 Brazil, supposed proof of glaciation 



in, 370 

 Brewer, Professor W. H., on want of 

 symmetry in colours of 

 animals, 217 

 Bromelia, animals inhabiting leaves 



of, 118 

 Bronn, Professor, on supposed useless- 

 ness of variations of ears and 

 tails, 136 

 Butler, Mr. A. G., on inedibility of 

 conspicuous caterpillars, 237 

 Butterflies, varieties of, 44 



small, of Isle of Man, 106 

 special protective colouring of, 



206 

 recognition by, 226 

 inedibility of some, 234 

 mimicry among, 240, 249 

 colour development of, 274 

 sexual coloration of, 271 



