"What particularly attracted his attention . . . were those occasional black masses commonly called "lost rocks." The rocks contained granite, like the rocks of the Great Lakes region, hundreds of miles to the north. ". . . he adopted the theory, now generally received, that these numerous boulders were transported hither by ice, when this region must have been inundated with water . . . They (the rocks) appear often so rounded and worn by attrition, as to lead many to believe that they were rolled along by currents sweeping from the north. It would seem, however, that ice was a more adequate agent in removing them."