But Woolly Billy, not fully acclimatized to the backwoods tradition and superstition, and uninformed as to the firmness and decision with which the fish-hawks are apt to resent any intrusion, had long hankered to explore the mysteries of that great nest. One morning he made up his mind to try it. Tug Blackstock, Deputy-Sheriff of Nipsiwaska County, was away for a day or two, and old Mrs. Amos, his housekeeper, was too deaf and rheumatic to "fuss herself" greatly about the "goings-on" of so fantastic a child as Woolly Billy, so long as she knew he had Jim to look after him. This serves to explain how a small boy like Woolly Billy, his seven-years-and-nine-months resting lightly on his amazingly fluffy shock of pale flaxen curls, could be trotting off down the lonely backwoods trail with no companion or guardian but a big, black dog. Woolly Billy was familiar with the mossy old trail to the lake, and did not linger upon it. Reaching the shore, he wasted no time throwing sticks in for Jim to retrieve, but, in spite of the dog's eager invitations to this pastime, made his way along the dry edge between undergrowth and water till he came to the bluff. Pushing laboriously through the hot, aromatic-scented tangle of bushes, he climbed to the foot of the old maple, which looked dwarfed by the burden of the huge nest carried in its crotch. Woolly Billy was an expert tree-climber, but this great trunk presented new problems. Twice he went round it, finding no likely spot to begin. Then, certain roughnesses tempted him, and he succeeded in drawing himself up several feet. Serene in the consciousness of his good intentions, he struggled on. He gained perhaps another foot. Then he stuck. He pulled hard upon a ragged edge of bark, trying to work his way further around the trunk. A patch of bark came away suddenly in his grip and he fell backwards with a startled cry. He fell plump on Jim, rolled off into the bushes, picked himself up, shook the hair out of his eyes and stood staring up at a round hole in the trunk where the patch of bark had been. A hole in a tree is always interesting. It suggests such possibilities. Forgetting his scratches, Woolly Billy made haste to climb up again, in spite of Jim's protests. He peered eagerly into the hole. But he could see nothing. And he was cautious--for one could never tell what lived in a hole like that--or what the occupant, if there happened to be any, might have to say to an intruder. He would not venture his hand into the unknown. He slipped down, got a bit of stick, and thrust that into the hole. There was no result, but he learnt that the hole was shallow. He stirred the stick about. There came a slight jingling sound in return.