494 
INDEX 
Willows, species and varieties of 
British, 77 
Wilson, Alexander, his account of 
the passenger-pigeon in North 
America, 31 
Wind-carriage of seeds explains many 
facts of plant distribution, 
371 
Wind-dispersal of seeds, objections to, 
365 
Wind-fertilised degraded from insect- 
fertilised flowers, 324 
Wings of stone-curlews (figure), 223 
why small but useless are re¬ 
tained, 416 
Wit and humour, origin of faculties 
of, 472 
Wollaston, Mr. T. W., on variation 
of beetles, 44 
on small butterfly in Porto 
Santo, 106 
Wolves, varieties of in Catskill Moun¬ 
tains, 105 
Wood, Mr. J., on muscular variations, 
447 
Mr. T. W., on variable colour¬ 
ing of pupae of cabbage butter¬ 
flies, 197 
Woodward, Dr. S. P., on variation of 
mollusca, 43 
Y 
Youatt, on breeds of sheep, 97 
Young animals often spotted, 289 
Z 
Zebra, markings for recognition and 
protection, 220 (note) 
THE END 
