INDEX. 
83 
Page 
Volcanic bombs, occurrence, shape, struc- 
ture, character, etc., of 40-45 
sections of - - 44 
views of.... 40,42,44 
Volcanic dust, exposure of plate showing 62 
occurrence of- 61-62 
Volcanic eruptions, various phases of 58-59 
Volcanic rocks, occurrence and character 
of 64-66 
Volcanoes, discussion of ■'■"> 59 
Page. 
I Water, analysis of, from Harney Lake. . . 31 
j Weather, record of, for 1900, table show- 
ing - 8 
White, I. C, reference to 76 
Whitehorse artesian basin, Oregon, loca- 
tion and area of 2B 
structure of 26 
Willow Creek Valley, Oregon, vegetation 
in, effect of overgrazing on 20 
Wind, deposits caused by. 19 
o 
