842 THE POPULAR SCIENCE MONTHLY. 



was by no means united on most questions to the professorship 

 of Geology and Paleontology in that institution. He went hack 

 under much more favorable conditions for scientific advancement 

 than had existed when he left the institution seven years before. 

 " His duties at that time were spread over the whole field of geol- 

 ogy, zoology, botany, museum and microscopical work. When 

 he returned, the faculty embraced a Professor of Geology and 

 Paleontology ; a Professor of Mineralogy and Economic Geology ; 

 a Professor of Zoology ; an Assistant Professor of Botany ; an 

 Instructor in the Microscopical Laboratory; and a Curator of 

 the Museum all of whose duties devolved upon one man in 1872." 

 He began on his return to the university the preparation of an 

 extended syllabus of a course of instruction in general geology, 

 accompanied by copious references to sources of information. He 

 presided over the Section of Anthropology at the Montreal meet- 

 ing of the American Association. He spent the summer of 1886 

 in connection with the Geological Survey of Minnesota in field 

 work in the extreme northern part of the State, north of Lake 

 Superior. His work extended into twenty-four townships, where 

 he noted and studied the outcrops at eight hundred and ninety 

 localities, and he spent much time in the succeeding winter in the 

 study for his first Minnesota report of the Archaean problems thus 

 developed. The observations made in this survey were impor- 

 tant, and were found to throw much light on some of the prob- 

 lems of Archa?an geology. The pjlan of the next year's survey 

 extended over the original Huronian area, and also over the iron 

 regions of Michigan and Wisconsin and into the area of the Ani- 

 mikie in northern Minnesota. He entered into the study an.d dis- 

 cussion of practical questions touching the stratigraphic relations 

 of the older terrenes and accumulated a large mass of data, the 

 discussion of which he was never able to complete. He planned 

 for a thorough discussion and examination of the data of the Ar- 

 chaean rocks, including their field relations and petrographic char- 

 acters, and for the sake of it declined all but the most important 

 invitations to lecture. In pursuance of this work he communi- 

 cated to the eighteenth report of the Minnesota Survey (1889) a 

 review of American opinion on the Presilurian rocks, and pre- 

 sented further results of his work in northern Minnesota at the 

 Toronto meeting of the American Association. His last year 

 (1890) was one of his busiest, and was occupied with lectures, at- 

 tendance on scientific meetings, geological excursions, and the 

 preparation of plans for enlarging the laboratory of the univer- 

 sity. Prof. Winchell was a leading spirit in the formation of the 

 Geological Society of America and in the establishment of the 

 American Geologist. 



His biographer in the American Geologist believes that Dr. 



