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 



Wollastoii, 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 



Youatt, on breeds of sheep, 97 

 Young animals often spotted, 289 



Zebra, markings for recognition and 

 protection, 220 (note) 



THE END 



Printed by R. & R. Clark, Limited, Edinburgh. 



