40 PROCEEDINGS OF THE BOSTON MEETING 



measurements of Cretaceous time," "Tepee buttes/' a joint paper by 

 Gilbert and Gulliver, and the description of a new laccolite locality. 



The Niagara Kiver and Great Lakes studies, which had been carried 

 on intermittently prior to 1894, were resumed more systematically 

 thereafter, and there appeared the National Geographic Monograph on 

 "Niagara Falls and their histor}^,'' the "History of the Niagara River," 

 published in the Sixth Annual Report of the Commissianers of the State 

 Reservation at Niagara, and the paper in the Eighteenth Annual Report 

 of the Survey on "Recent earth movement in the Great Lakes region," 

 with a number of less formal discussions of phases of the problems, pre- 

 sented in other ways. 



The Coon Butte study eventually became the basis for the stimulating 

 presidential address before the Geologic Society of Washington, on the 

 "Origin of hypotheses," a paper to be compared with the earlier address 

 on the "Inculcation of scientific method by example." 



The Coon Butte investigation also led Gilbert to a study of the craters 

 of the moon, and this to the delivery of that most fascinating address 

 on "The moon's face," which was presented before the Philosophical 

 Society of Washington in December, 1892. 



Meanwhile Gilbert was serving geology in an international capacity as 

 chairman of the Commission of the International Geological Congress 

 on Geological Bibliography. He also continued the work represented 

 in the Tenth Annual Report of the Survey in the capacity of chairman 

 of a new Survey Committee on Geologic Nomenclature and Classificar 

 tion, whose results appear in the Twenty-fourth Annual. 



In 1899, following a short excursion to Mexico, there came the oppor- 

 tunity for studies of problems connected with glaciation, afforded by the 

 Harriman Expedition, followed by the sumptuous reports of that expe- 

 dition, the one on "Glaciers and glaciation" being by Gilbert himself. 



He was led also to review the evidences for and against the "Fault 

 block" theory of the origin of the Basin Ranges, by the presentation of 

 Spurr's ^^ opposing views before this society in 1900. Gilbert revisited 

 the field in 1901, with his companion in so many similar studies, Willard 

 D. Johnson, but the loss of a part of the records of that work led to the 

 postponement of its presentation. Field-work was resumed and ex- 

 tended in very recent years, and just before his death Gilbert submitted 

 for publication a report, incomplete as a whole, but complete as to cer- 



11 J. E. Spurr : Origin and structure of the basin ranges. BuU. Geol. Soc. Am., vol. 

 1901, pp. 217-270. 



