Whale, breathing apparatus of, 321; _skeleton of whalebone_, 318; _suckling her young_, 319; ancient origin of, 303; a warm-blooded mammal, 317; kept warm by blubber, 320; long life of, 331; parasites on, 331. Whalebone, nature of, 328. Whiskers of tiger are feelers, 289. White animal tints in winter, 347. Wild duck, strokes of wing of, 134. Wing, rapid strokes of a bird’s, 134; structure of a bird’s, 127. Wing-feathers, hooklets on, 133. Wings of a bat, how formed, 233. Wolf, affection of a, 286; ancestor of the dog, 286; _dog-like form and teeth of_, 283; structure of, 284; the only social tribe of carnivora, 286. _Wombat_, 197; a marsupial, 195. _Woodpecker, the great green_, 163; tongue of, 164. _Wood-pigeon on her nest_, 160. _Woolly monkey and child_, 247. Worm, compared to the lancelet, 13. _Wren, common, nest of_, 171. Wryneck, 172. _Xiphodon_, 210; ancestor of the antlered animals, 213; ancestor of ruminants, 261. Yapock, 300. THE END. WORKS OF ARABELLA B. BUCKLEY. The Winners in Life’s Race; OR, THE GREAT BACKBONED FAMILY. With numerous Illustrations. 12mo. Cloth, gilt, $1.50 Life and Her Children. Glimpses of Animal Life from the Amœba to the Insects. With upward of One Hundred Illustrations. 12mo. Cloth, $1.50. Fairy-Land of Science. With numerous Illustrations. 12mo. Cloth, $1.50. “It deserves to take a permanent place in the literature of youth.”--_London Times._ “So interesting that, having once opened the book, we do not know how to leave off reading.”--_Saturday Review._ A Short History of Natural Science and the Progress of Discovery, FROM THE TIME OF THE GREEKS TO THE PRESENT DAY. For Schools and Young Persons. With Illustrations. 12mo. Cloth, $2.00. “A most admirable little volume. It is a classified résumé of the chief discoveries in physical science. To the young student it is a book to open up new worlds with every chapter.”--_Graphic._ “The book will be a valuable aid in the study of the elements of natural science.”--_Journal of Education._ _For sale by all booksellers; or sent by mail, post-paid, on receipt of price._ New York: D. APPLETON & CO., 1, 3, & 5 Bond Street. THE INTERNATIONAL SCIENTIFIC SERIES. EACH BOOK COMPLETE IN ONE VOLUME, 12MO, AND BOUND IN CLOTH. I. FORMS OF WATER: a Familiar Exposition of the Origin and Phenomena of Glaciers. By J. TYNDALL, LL. D., F. R. S. With 25 Illustrations. $1.50. II. PHYSICS AND POLITICS; Or, Thoughts on the Application of the Principles of “Natural Selection” and “Inheritance” to Political Society. By WALTER BAGEHOT. $1.50. III. FOODS. By EDWARD SMITH, M. D., LL. B., F. R. S. With numerous Illustrations. $1.75.