The cattle pastured near the deepest of the swimming holes, and it often fell to the lot of the boys to bring them into the palisade at sunset. This was a duty of no little importance, because if any of the cattle wandered away into the forest and were lost, they could not be replaced. It was now the latter half of summer, and the grass and foliage were fast turning brown in the heat. Late on the afternoon of one of the very hottest days Henry and Paul went to the deepest swimming hole. There had not been a breath of air stirring since morning; not a blade of grass, not a leaf quivered. The skies burned like a sheet of copper. The boys panted, and their clothing, wet with perspiration, clung to them. The earth was hot under their feet. Quickly they threw off their garments and sprang into the water. How cool and grateful it felt! There they lingered long, and did not notice the sudden obscurity of the sun and darkening of the southwest. A slight wind sprang up presently, and the dry leaves and grass began to rustle. There was thunder in the distance and a stroke of lightning. The boys were aroused, and scrambling out of the water put on their clothing. "A storm's coming," said Henry, who was weatherwise, "and we must get the cattle in." These sons of the forest did not fear rain, but they hurried on their clothing, and they noticed, too, how rapidly the storm was gathering. The heat had been great for days, and the earth was parched and thirsty. The men had talked in the evening of rain, and said how welcome it would be, and now the boys shared the general feeling. The drought would be ended. The thirsty earth would drink deep and grow green again. The rolling clouds, drawn like a great curtain over the southwest, advanced and covered all the heavens. The flashes of lightning followed each other so fast that, at times, they seemed continuous; the forest groaned as it bent before the wind. Then the great drops fell, and soon they were beating the earth like volleys of pistol bullets. Fragments of boughs, stripped off by the wind, swept by. Never had the boys in their Eastern home known such thunder and lightning. The roar of one was always in their ears, and the flash of the other always in their eyes. The frightened cattle were gathered into a group, pressing close together for company and protection. The boys hurried them toward the stockade, but one cow, driven by terror, broke from the rest and ran toward the woods. Agile Henry, not willing to lose a single straggler, pursued the fugitive, and Paul, wishing to be as zealous, followed. The rest of the cattle, being so near and obeying the force of habit, went on into the stockade. It was the wildest cow of the herd that made a plunge for the woods, and Henry, knowing her nature, expected trouble. So he ran as fast as he could, and he was not aware until they were in the forest that Paul was close behind him. Then he shouted: "Go back, Paul! I'll bring her in."