Trade winds, 84, 87, 88, 89 Trails, 240, 241 Transhumance, 179, 189 Tree of Heaven, 78 Tropical forest, 120, 131, 169 Tsetse flies, 161 Tulip, 124 Tundra, 132, 136, 164, 169, 239 Tunny, 149 Turkey, 181 Tyne gap, 47 (fig. 5), 49, 73 Tyrol, 62 Uganda, 163 Ungulates, 155, 156, 157 United States, cotton of, 234; flora of, 140, 141; numbers of hoofed animals in, 243, 244; people of, 217; rainfall of, 102; structure of, 35, 36; survey work in, 14; trees of, 78, 79; weather of, 107 U-shaped valleys, 57, 61, 64 Vienna, temperature of, 99 Vilaine, 223 Vine, 126, 127, 171, 172, 173, 183, 187, 190 Visp, 42 Voles, 158 V-shaped valleys, 55 Wales, 54, 197, 200 Waterfalls, 40, 41, 56, 58, 60 Water hemisphere, 21 Water power, 58, 69, 230 Watersheds, shifting of, 47 Water transport, 236-238 Weald, 226 Weasel, 159 Weather, 103 _et seq._ Weathering, 46, 51 Wellingtonia, 136 Welsh, 211 Weymouth pine, 139 Whales, 145 Wheat, 126, 138, 139, 171, 172, 182, 183, 185 Whitefish, 150 Whortleberries, 185 Wild boar, 156 Wild cat, 159 Wild horse, 166 Wild sheep, 156, 166 Willows, 136 Wine, 183, 187, 190 Winter gulf of warmth, 206 Wood anemone, 123 Woodland, 115, 116; see also Forests Wolf, 159 Wolverene, 159 Yak, 244 Yellow fever, 161 York, 232 Yorkshire, 46, 47 (fig. 5), 232 Young rivers, 30, 40, 56 Yurt, 189 Zoogeographical regions, 151-154 THE HOME UNIVERSITY LIBRARY _of Modern Knowledge_ Is made up of absolutely new books by leading authorities The editors are _Professors Gilbert Murray, H. A. L. Fisher, W. T. Brewster and J. Arthur Thomson_. Cloth bound, good paper, clear type, 256 pages per volume, bibliographies, indices, also maps or illustrations, where needed. Each complete and sold separately. =_Per volume_, 90 cents.= LITERATURE AND ART. [_Order Number_] 73. =EURIPIDES AND HIS AGE.= =By Gilbert Murray=, Regius Professor of Greek, Oxford. 101. =DANTE.= =By Jefferson B. Fletcher=, Columbia University. An interpretation of Dante and his teaching from his writings. 2. =SHAKESPEARE.= =By John Masefield.= "One of the very few indispensable adjuncts to a Shakespearean Library."--_Boston Transcript._ 81. =CHAUCER AND HIS TIMES.= =By Grace E. Hadow=, Lecturer, Lady Margaret Hall, Oxford; Late Reader, Bryn Mawr. 97. =MILTON.= =By John Bailey.= 59. =DR. JOHNSON AND HIS CIRCLE.= =By John Bailey.= Johnson's life, character, works, and friendships are surveyed; and there is a notable vindication of the "Genius of Boswell."