Professor Davis on "Niagara Falls."

Professor W. M. Davis delivered the sixth and last of the illustrated geological lectures yesterday afternoon in the Geological Lecture Room. His subject was, "The Geological History of Niagara Falls."

Professor Davis explained the generally accepted theory for the existence of Niagara, from the point of view of the advanced scientific understanding of the last half century. He showed that the Niagara river, in producing the Falls, tumbles into a gorge which it has itself formed and which is not, as was formerly held, the result of a craking open of the earth's surface. He went on to trace the successive stages of change and development of the Great Lakes region, from the time of the last glacial period. As a result of geological changes in the various parts of this region, Niagara now receives most of the water of the Great Lakes.