"The Colorado Canon."

In a lecture yesterday afternoon on "The Lesson of the Colorado Canon" Professor W. M. Davis showed by a series of stereopticon views that the great truth revealed by a study of this canon is the vast amount of time during which the earth has been undergoing processes of formation and transformation. Professor Davis first stated that the canon as it exists today has been carved out of solid rock by the erosion of water and the elements. He then proved that not only has this work been going on for ages past but also that incomparably longer there have been at work a wonderful succession of agencies building up and tearing down the very rock out of which the canon was afterward cut. Professor Davis did not attempt to estimate the time during which all this has been accomplished but showed that it must have been of a very great duration.