HALL, Christopher Webber, geologist, born in Wardsborough, Vermont, 28 February, 1845. He was graduated at Middlebury college, Vermont, in 1871, and then became principal of Glens Falls academy. In 1873-'5 he was superintendent of city schools in Owatonna, Minnesota He then went abroad and spent three years in scientific study in the University of Leipsic. In 1878 he was called to the chair of geology, mineralogy, and biology in the University of Minnesota, which he still retains (1887). While in Leipsic he performed some lithological work on the geological survey of Saxony, under Credner, and, after being called to the professorship that he now holds, he was appointed assistant geologist on the geological and natural history survey of Minnesota. In 1883 he became an assistant geologist on the United States geological survey, and was assigned to the Lake Superior division. He was given the investigation of the crystalline rocks of central and southwestern Minnesota, in which work he is still engaged as far as his professional duties will permit. Professor Hall is a member of scientific societies, and his papers have appeared chiefly as reports of his work contributed to surveys.