492 
INDEX 
Weale, Mr. J. P. Mansel, on Ajuga 
ophrydis, 397 
Weapons and tools, how they affect 
man’s progress, 174 
Webbefr, Mr,, on food of humming- 
birds, 321 
Weevils often resemble small lumps 
of earth, 42 
Weir, Mr. Jenner, on a moth refused 
by birds, 63 
on beetles refused by birds, 66 
on caterpillars eaten and rejected 
by birds, 84 
West Indian islands, large and bril- 
liant butterflies of, 386 
peculiarly coloured birds of, 387 
Westwood, Professor, objections to 
theory of mimicry, 76 
Whip-snakes, 304 
White animals poisoned where black 
escape, 389 
White colour in domesticated and 
wild animals, 48 
in animals, how produced, 359 
(note) 
doubly prejudicial to animals, 
390 
White colours influencing sense-per- 
ception, 389 
White tropical birds, 301 
Whitney, Professor, on the Calaveras 
skull, 447 
Wild and domesticated animals, essen- 
tial differences of, 30, 31 
Will really exerts force, 211 
probably the primary source of 
force, 212 
Wilson, Dr., on pottery from North 
American mounds, 427 
Winds, influence of, on temperature, 
225 
direction of, near equator, 225 
cause of cold near equator, 226 
Wood, Mr. T. W., on orange-tip 
butterfly, 43 
Woodcocks and Snipes, protective 
colouring of, 39 
Woodpeckers, why scarce in England, 
25 
Woods from equatorial forest-trees, 
245 
Works of art in auriferous gravels of 
California, 445 
Xanthia, autumnal colours of these 
moths, 45 
Zebra, possible use of its stripes, 368 
Zebras, 164 
Zingiberacese, 254 
J 
THE END 
Printed by R. & R. Clark, Limited, Edinburgh. 
