270 



Travertines, 12 

 Triassic period, 8 

 Trochodendraceae, 91 

 Trous. linden at, 2v>5 

 Tulii) tree, ancestors of, 173 



atavistic leaves of, 175 



flowers of, 172 



fossil leaves of, 177 



geologic history of, 178, 179 



leaves of, 1 73 



origin of stipules of, 1 74 



range of, 172 



size of, 171 



sketch of, 171 

 Tupelo ^uni, 243 



U 



Uniformitarianism, 4 

 Unter den Linden, 235 

 Upland sumach, 207 



Ward, L. R, cited, 160 

 Water ash, 228 

 Water elm, 153 

 Water locust, 199 

 Weeping willow, 83 

 White ash, 228 

 Whitcwood, 233 

 William Wallace oak, 133 

 Willow baskets, 82 

 Willow family, 81 

 Willows, sketch of, 82 



sjjecics of, 83 

 Winged elm, 153 

 Witch hazel, blooming of, 189 



distribution of, 189 



geologic history of, 189, 190 



sketch of, 188 ' 

 \\'itch hazel family, 181 

 Wordsworth, Wm., quoted, 39 

 Wych elm, 103, 148 

 \\'\-ch hazel, 188 



\' 



Virgil, cjuoted, 131 



W 



Wahoo, 153 

 Walnut family, 68 

 Walnuts, in South America, 



in Swiss lake dwellings, 7. 



origin of name, 73 



range of, 74 



sketch of, 73 



Yaupon, 213 

 Yellow locust, 193 

 Yellow poplar, 171 



Zelkova, 146 

 Zeus, cradle of. 



131 



