44 PROCEEDINGS OF THE SAINT LOUIS MEETING 



detailed investigations of his assistants into the geological structure of 

 the reofion, which is mostly covered bv imeous rocks, with smaller areas 

 of Stratified rocks exposed in several mountain ranges, and he investi- 

 gated portions of the area in detail himself. The region surveyed was 

 over 3,000 square miles in extent and the field-work continued for seven 

 seasons, from 1883 to 1889. The following season Weed and Iddings, 

 under the charge of Mr. Hague, explored and mapped the geology of the 

 area north of the Yellowstone National Park, which is known as the 

 Livingston quadrangle. 



The descriptive geology, petrography, paleontology, and paleobotany 

 of the park have been published as part 2 of the Yellowstone Park mono- 

 graph, in which certain chapters have been prepared by Hague. He has 

 also made reports on the work from time to time in the Annual Eeports 

 of the Director of the United States Geological Survey, besides writing 

 several special papers which appeared as presidential addresses before the 

 Geological Society of America and the Geological Society of Washing- 

 ton — one on the "Early Tertiary volcanoes of the Absaroka Eange" ; the 

 other on '^The origin of the thermal waters in the Yellowstone Xational 

 Park." In 1893, with T. A. Jaggar, Jr., as assistant, he studied the geol- 

 ogy of the country east of the park, which had been set aside as a forest 

 reserve and annexed to the Yellowstone Park reserve. He visited the 

 Yellowstone Park a number of times to continue his observations of the 

 hot springs and geysers. A list of his scientific publications is given at 

 the end of this memoir. 



In 1885 Arnold Hague was elected a member of the Xational Academy 

 of Sciences, and served as its Home Secretary from 1901 to 1913, and 

 represented the Academy at various celebrations and anniversaries of 

 foreign universities and learned societies. He was appointed a member 

 of tlie Forestry Commission in 1896 and took an active part in its work. 

 He was a Fellow of the Geological Society of London and of the Geolog- 

 ical Society of America, being elected its President in 1910. He was a 

 member of the American Philosophical Society, a Fellow of the American 

 Association for the Advancement of Science, of the Society of Xatural- 

 ists, the Institute of Mining Engineers, the Washington Academy of 

 Science, and the Geological Society of Washington. He was a vice-presi- 

 dent of the International Geological Congress at Paris in 1900 : at Stock- 

 holm in 1910, and at Toronto in 1913. In 1901 Mr. Hague received the 

 honorary degree of Sc. D. from Columbia I^ni versify, and in 1906 the 

 degree of LL, D. from the University of Aberdeen. He was a member of 

 the Centurv and University clul)s in Xew York Citv, and of the ^letro- 



