MEMOIRS OF DECEASED FELLOWS 257 



This handsome quarto volume contains a chapter on "Topo- 

 graphic Features of Lake Shores" which is the classic writing on 

 shore-line topography. 



It is interesting to note that he published no articles relating to 

 the Rochester region until after his long period of western explora- 

 tion. His best publication in reference to the Ontario basin was in 

 1885, on the Iroquois shoreline ; although he then called it simply 

 the old shore-line of Ontario. Between then and 1891 he published 

 six papers on the Pleistocene features or glacial history of the 

 Ontario basin ; and one on the sink ridges near Caledonia. 



From 1892 to 1900, eight years, his list of writings is forty ; cov- 

 ering a wide range of subjects in geology. Of these eight related 

 to western New York. From 1901 to 1905 twenty-five titles are 

 on record, of which only two concern western New York. During 

 1906 and 1907 he published nine articles, one being on Niagara. 

 In 1908 only four articles, including another on Niagara, are re- 

 corded in the bibliography. Since 1908 only five titles are credited. 

 Altogether this makes 156 titles, of which 18 relate to the geology 

 of western New York or the Ontario basin. 



The few papers pubHshed in later years is explained by his poor 

 health, due to a slight stroke of apoplexy. After this time by very 

 careful living he was able to do some work in a deliberate way. 

 His latest study was the transportation of detritus by streams, with 

 reference to hydraulic mining in California. This work, spread 

 over several years, was published last year, being his last publica- 

 tion. It is entitled "Hydraulic-mining Debris in the Sierra 

 Nevada," and is Professional Paper 105 of the Survey list, form- 

 ing a quarto of 154 pages, with numerous maps and reproduction 

 of photographs. 



Dr. Gilbert's only writing for school textbooks in his "Intro- 

 duction to Physical Geography," in collaboration with Professor 

 A. P. Brigham. This was published in 1892 by D. Appleton and 

 Company. 



Geology is so broad and comprehensive and so inviting in many 

 directions that some men with active minds and lively interest scat- 

 ter their studies over diverse fields. Dr. Gilbert more wisely con- 

 fined his work to physical geology, especially geodynamics, in which 

 he was recognized as a master. He published practically nothing 



