480 
INDEX 
B 
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 
pupae 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 Heliconidae, 
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 Heliconidte, 
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 
irse 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 unornamented, 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 
