"Gentlemen," said the professor, "as surely as you stand on the shore of a great lake, which passed away in comparatively modern times, science stands on the brink of important revelations. We have here the evidence of the rocks that man existed on this earth when the vast level upon which you are about to enter was covered by its mass of water. The waves lapped against the Rocky Mountains on the west, and against the ridges on which you are standing, upon the east. From previous explorations, I can assure you that the buffalo now feed over a surface strewn with the remains of those monsters which inhabited the waters of the primitive world, and the grasses suck nutriment from the shells of centuries. Geology has held that man did not exist during the time of the great lakes. I assert that he did, gentlemen, and now an inhabitant of that period steps forward to confirm my position. This man walked barefooted, and yet the contour of one of the feet, so different in shape from that of any wild people's of the present day, shows that it had been confined by some stiff material, like our leather shoes. The appearance of the big toe is especially confirmatory of this. I would call your attention, gentlemen, to the block which contains companion impressions of the right and left foot. The latter is deep, and well defined, every toe being separate and perfect. The former is shallow, and spread out, with bulged-up ridges of stone between each toe. These are exactly the impressions your own feet would make, on such a shore to-day, were the sand under the right one to be of such a yielding nature that in moving you withdrew it quickly, and rested more heavily on the other, the material under which was firmer. Your right track would spread, the mud bulging up between the toes, and forcing them out of position, and the material nearly regaining its level, with a misshapen impression upon its surface. "You will also perceive that the sand was already hardening into rock when our ancient friends walked over it. I use the plural because, if I may venture an opinion from this hasty examination, I should say the two tracks were those of a female, the single one that of a man. From the position of the blocks they were probably walking near each other at that precise time when the new rock was soft enough to receive an impression and hard enough to retain it. You will perceive that the surface of the stone is bent down into the cavities, as that of a loaf of half-raised bread would be should you press your hand into it." Sachem thought that the couple might have been an ancient Paul and Virginia telling their love on the shores of the old-time lake. The Professor continued: "You notice close beside the two imprints an oval, rather deep hole in the rock, precisely like that a boy often makes by whirling on one heel in the sand."