640 



INDEX. 



PAGE 



Venus pertenuis 513 



Yespa avatina 514 



Vesuvius, section 95 



Viburnum Newberrianum 497 



Viscosity theory of glaciers, Forbes's 61 



Viviparus trochif ormis 498 



Volcanic cone, comparison with exogenous 



tree 96 



cone, formation 93 



cones, kinds 93 



Volcanic conglomerate 214 



phenomena, subordinate 101 



rocks, decay 7 



rocks, mineral composition and sub- 

 groups 207 



Volcanoes, aqueo-igneous theory 100 



chemical theory 99 



definition 87 



estimate of age 97 



internal fluidity theory 98 



mechanical theory 100 



size, number, and distribution 88 



superheated gas theory 100 



theory 97 



Volutalithes dumosa 512 



symmetrica 512 



Voltzia heterophylla 415 



Von Cotta 204 



W 



Wahsatch beds 530 



range 259, 206 



Walchia cliff usus 457 



pinif ormis 412 



Walcott 299 



Wallace 277, 473 



modification of Croll's theory of climate 592 



Ward 358, 475, 497 



Water, chemical agencies 74 



mechanical agencies 9 



comparison of different forms 73 



PAGE 



Waterfalls 12 



Water-shed 10 



Waters, subterranean 74 



Waves, erosion by 34 



transporting power of 38 



and tides, examples of action 35 



Wealden. „ 424 



Weed 161 



Wells, artesian 75 



White 299, 497 



White River Basin 535 



Whitney 257, 469, 473 



Williamson 367, 369 



Williston 439 



Winchell, A 15 



Winding course of rivers 23 



Winds, action 8 



Wood, petrified 191 



Worm, marine trail 321 



Worms, tracks and borings, Silurian 320 



Worm-teeth 321 



X 



Xilocopa senilis 514 



Y 



Yellowstone Park, springs in 79 



geysers of 103 



Yosemite, falls of 15 



Z 



Zacanthoides typicalis 299 



Zaniia spiralis 426 



Zamites occidentalis 459 



Zaphrentis bilateralis 306 



Wortheni 331 



Zeacrinus elegans v . 393 



Zeuglodon cetoides 528 



Zylobius sigillariae 397 



THE END, 



