Arthur M. Winfield, The Rover Boys on the Farm (1908)
“ Half an hour of hard climbing brought the boys to the vicinity where they had first fallen into the holes leading to the cave, and then they advanced cautiously and in almost absolute silence. They stopped to listen several times, but heard nothing but the calls of some birds and the trickling of water over the rocks. Arriving at the top of the hole from where the dirt and stones had been thrown, they gazed around with interest. Where the soil was soft they could see the footprints of shoes much larger than those they themselves wore. ”
