28 rROCEEDIXGS OF THE WASHINGTON MEETING 



1909. Economic geology in the United States. Mining World, vol. xxx, pp. 



1209-1211, June 26, 1909; Canadian Min. Inst. Jour., vol. xii, pp. 89- 

 101. 



1910. Cananea Mining district of Sonora, Mexico. Econ. Geologj', vol. v, No. 



4, pp. 312-366. Abstract: Eng. and Min. Jour., vol. xc. pp. 402-404. 



1910. The Cobalt Mining district of Ontario. Abstract: Science, n. s., vol. 

 xxxi, p. 517. 



1910. Criteria of downward sulphide enrichment (discussion). Econ. Geol- 

 ogy, vol. V, No. 5, pp. 477-479. 



MEMOIR OF CHRISTOPHER WEBBER HALL 

 BY NEWTOjN^ H. WINCHELL 



Prof. C. W. Hall, Avhose death took place May 10, 1911, at his home in 

 Minneapolis, was born at AVardsboro, Windham County, Vermont. He 

 attended the district school and the academies at Townsend and Chester. 

 He was graduated from Middlebury College, Vermont, in 1871, and at 

 once accepted the principalship of the academy at Glens Falls, Xew York, 

 but the next year removed to Minnesota, where he was elected principal of 

 the High School at Mankato, and in 1874 superintendent of the public 

 schools of Owatonna. He studied geology and allied subjects about two 

 and one-half years at Leipzig, returning to Middlebury College in 1877. 

 In 1878 he was employed as an assistant in the department of geology 

 under Prof. X. H. Winchell, at the University of Minnesota. He also had 

 a quasi-connection with the State geological survey, but his actual field 

 work in geology in Minnesota was either private work or was for the 

 United States Geological Survey. In 1879 he was assigned by the regents 

 to the instructional work in geology and allied Ijranches of science, and 

 he continued in charge of that work iintil his death, the departments of 

 Animal Biology and of Botany meanwhile developing into coordinate 

 rank. 



Professor Hall was largely instrumeDtal in the establishment of the 

 School of Mines of the University of Minnesota, and for a few years he 

 was dean of a school composed of engineering, metallurgy, and mechanic 

 arts, a combination which in the formative stages of the imiversity was 

 found to be incongruous. Each of these departments soon expanded into 

 a separate college, with its own dean and faculty. In 1898 Professor 

 Hall spent the most of a vacation year in Germany. 



For many years Professor Hall was active in the Minnesota Academy 

 of Science, especially as secretary, and on him fell many of the executive 

 burdens. He was also president of the x\cademy in 1901, 1902, 1904, 

 and 1905. He edited the bulletins of the Academv for many years. He 



