learned that an arrow flew more smoothly and evenly and that with it thus feathered he was far surer of his game. This was counted a curious thing, and some held that the red colour made a spell or charm and so guided the arrow rightly, but with the trying of other feathers of any colour, even those from the drab geese, it was found that they served as well. The gray goose shaft sufficed. It was most curious, but it was a potent thing, and soon all arrows were thus feathered and the tribe became the greatest of all archers. Bad would it be for any foeman who might attack us. Much I thought upon this thing and of how always it seemed that one discovery was followed in its needs and new calls by another. There happened about this time another thing most interesting to us all and fine in its results, following what was conceived by Hammer. He had long looked enviously upon the smaller boulder of the two we had found in the canyon, because it seemed so full of copper of the finest quality, though we paid no attention to it since we had such an abundance of the “float” about us. He would not be denied, though I made much sport of him. Hammer caused a pit to be dug close beside the boulder and a little deeper than its height, and the bottom of this he had filled with the dryest of wood. Then he brought to the pit’s side a veritable mountain of wood as dry, and was ready for the test. The strong men of the tribe were summoned and there was a great upheaval of the rock with levers, and it was tumbled down upon its bed of wood, which was promptly fired. As the flames rose other wood was heaped upon the rock until it was hidden from view, and so, night and day, was the great hot fire continued, men bringing more fuel all the time and working by watches to keep at reddest heat the bed of coals in the midst of which the rock lay. None cared to approach very near that astounding fire. It was on the fourth night that the climax came, and well it was for the firemen at the time that they were resting behind a boulder at a little distance from the flames, for there came an explosion which fairly lifted the village from its sleep and sent that copper rock in fragments in all directions. Great was the reward of the experiment, and it was good that we should thus learn what fire could do.