IV 



TABLE OF CONTENTS 



Chapter XI. Divers duties on the Powell survey: page 



1877-1879 109 



Land classification 109 



Triangulation in Utah and Arizona 110 



Barometric hypsometry 111 



Diurnal variation of the barometer 113 



Geology of the Black Hills 113 



Physiography of the Black Hills 114 



Personal items 116 



Chapter XII. The United States Geological 



Survey 117 



The consolidation of the earlier surveys 117 



From Salt Lake City to Washington IIS 



Distractions of office work 118 



The Great Basin mess 120 



Chapter XIII. Lake Bonneville 123 



Gilbert's first assignment on the national 



survey 123 



Earlier work on Lake Bonneville 123 



The Bonneville outlet... 124 



Two humid epochs 126 



Bonneville clays and marls 127 



Preliminary reports on Lake Bonneville 129 



The topographic features of lake shores 130 



The Bonneville monograph 131 



Chapter XIV. Increasing scientific relations: 



1881-1890 133 



The Philosophical Society of Washington.. 133 

 A review of Whitney's "Climatic Changes". 133 

 The American Naturalists and the Amer- 

 ican Association 134 



The National Academy of Sciences: De- 

 flection of rivers 135 



Age of the Equus fauna 136 



Joints in Bonneville clays 137 



Home affairs 137 



Geology of the Appalachians 138 



Chapter XV. The inculcation of scientific 



method by example 143 



Gilbert's first presidential address 143 



The scientific guess 144 



First views on isostasy 145 



Chapter XVI. The proglacial Great Lakes 147 



Reaction of the West upon the East 147 



The shore lines and outlet of Lake Iroquois. 148 



A popular article on the Great Lakes 150 



Chapter XVII. The history of Niagara River__ 153 



The retreat of the Falls: 1S86 153 



The Toronto lecture: 1889 154 



Variation in the volume of Niagara 156 



The human element 157 



Chapter XVIII. A trip abroad 159 



Scientific meetings in England 159 



A week-end at a country seat 161 



Impressions of a London club 161 



Three days in Paris 162 



Chapter XIX. Three years as chief geologist of 



the national survey: 1889-1892 165 



Change from scientific to administrative 



duties 165 



The larger duties of a chief geologist 166 



Criticism of manuscripts 167 



Chapter XIX — Continued. page 



Standard geological maps: 1887-1S89 168 



Revision of 1902-3 171 



Correlation papers 171 



The smaller duties of a chief geologist 172 



The disaster of 1892 173 



After fifty years 176 



Chapter XX. General scientific activities: 



1891-1900 179 



The International Geological Congress of 



1891 179 



The origin of Coon Butte 181 



The moon's face 183 



Scientific societies in Washington 186 



The Geological Society of America 188 



The National Academy of Sciences 190 



Other scientific societies 191 



Chapter XXI. Personal relations: 1S91-1900.. 193 



College lectures 193 



Literary work 195 



A generous trait of Gilbert's character 198 



Lost in Philadelphia 199 



Home affairs 199 



Gilbert's religious views 201 



Chapter XXII. Field work in Colorado: 1893- 



1895 203 



A temporary resumption of work in the 



West 203 



Published records of work in Colorado 205 



The Pueblo geologic folio 206 



Subsequent valleys 207 



Chapter XXIII. Discussions of isostasy 211 



The strength of the earth's crust 211 



The geodetic treatment of isostasy 212 



Three essays of 1895 214 



Chapter XXIV. Niagara and the Great Lakes. 217 



A return to Niagara 217 



The first eastward discharge of the pro- 

 glacial lakes 218 



Relations of successive cross-spur channels. 220 



A long channel floor as a great highway 220 



The Niagara escarpment 22 1 



Glacial erosion in western New York 222 



Modern variations in the Great Lakes 223 



The future discharge of the Great Lakes at 



Chicago 224 



The profile of the bed of the Niagara gorge. 225 



Chapter XXV. Glaciers and glaciation of Alaska. 227 



The Harriman expedition to Alaska, 1S99__ 227 



Glaciers and glaciation 227 



Glacial erosion of fiords 228 



Method of discussion of glacial erosion 229 



Physiographic items 230 



Submarine glacial erosion 231 



Chapter XXVI. A later study of the basin 



ranges 233 



The basin ranges are long neglected 233 



A dissenting opinion 234 



Gilbert as censor 236 



The summer of 1901 in Utah 238 



Loss of the field maps 239 



Field notebooks of 1901 240 



The Fish-spring Range 242 



The House Range 242 



