"The name Narrows is derived from the fact that at this place the Delaware River has forced itself through the rocky barrier," continued the Professor, "hedged in on one side by cliffs of perpendicular rock, three hundred feet high, extending some distance along the river, leaving scarcely room at some places for the river and the canal. Some quite rare plants grow here, said to be found in few other localities in the United States. You see the highest flat rock along the Narrows? It is called 'Top Rock' and rises to a height of more than three hundred feet. We shall drive around within a short distance of it; then, after passing a small house, we are obliged to walk across a field of ploughed ground; follow the well-beaten path between trees and undergrowth, and 'Top Rock' is before us. Stepping upon the high ledge of rock projecting out over the road beneath, we discover it may also be reached by following a precipitous path and clinging to bushes and trees, but none of the party venture. Recently the body of a man who had been searching for rare birds' eggs on the side of this self-same rock was found dead on the path below the rocks. What caused his fall is not known. No wonder Aunt Sarah says it makes her dizzy when you boys skip stones across the river while standing on the rock." The beautiful view of the Delaware River and the scenery on the opposite side was something long to be remembered. While the party were going into raptures over the beautiful sight, Professor Schmidt turned to Mary and remarked: "In those rocks which rise in perpendicular bluffs, several hundred feet above the level of the river, are evidence that prehistoric man may have inhabited the caves in these same walls of rock along the Delaware. From implements and weapons found, it does not require any great effort of imagination to believe the 'Cave Man' dwelt here many centuries ago." Fritz Schmidt was much interested in his father's conversation, and from that time on called Ralph Jackson Mary's "Cave Man." Leaving Top Rock, the party wended their way back to the waiting carriages in the road, and drove to the "Ringing or Musical Rocks." They had been informed that their nearest approach to the rocks was to drive into the woods to reach them. Passing a small shanty at the roadside, where a sign informed the passerby that soft drinks were to be obtained, the party dismounted and found, to their surprise, a small pavilion had been erected with bench, table and numerous seats composed of boards laid across logs, where camp meetings had formerly been held. As the large trees furnished shade, and a spring of fresh water was near by, they decided to "strike" camp and have lunch before going farther into the woods.