The investigation of the pre-Glacial valleys of the Finger Lakes, or of the Iroquoian Lakes, as designated by Mr. John Corbitt,2 was a natural sequel to the study of the origin of the basins of the Great Lakes. As few persons are now remaining familiar with the beginnings of the researches into the history of the lakes, some account of these may be introduced. A generation ago the most popular explanation of their origin was that assigning to glaciers the work of having excavated the basins. This theory was based on the opinion of Sir A. Ramsay, of the Geological Survey of Great Britain, who said that “the lake basins could only, I believe, have been scooped out by true continental glacier ice like that of Greenland,” a belief based on the one fact that the lakes occur in ice-worn regions. . . .