Now the roof remained. This was the most difficult task of all. Three boys went on the roof, and two below handed up brush as fast as it was required. They began at the lower side in front, and inserted the brush so as to lie along the slope of the roof like thatch. The butt-end of each bush was inserted, and the brush ends projected. The flat branches of fir trees are of such a nature that they will lie very close to any surface on which they may be placed. These brushes were all placed in double layers; each upper row overlapped the lower one; and thus a roof was formed thick and close enough to turn any ordinary fall of rain, though, of course, it could not be expected to keep out the water in case of a prolonged storm. After the roof was all covered, the last brush at the upper edge was intertwined with others which were placed across them, and these again were all securely fastened to the poles below. Then their spruce camp was finished, and was almost an exact counterpart of the one which they had built in the woods. They had done it well and quickly, for long practice in this work in their own woods had given them great skill in the construction of such buildings as these. The last thing to attend to was the beds. All the brush that remained was brought inside and laid lengthwise at-the rear of the camp. Then they went into the woods, and gathered an immense quantity of dry, soft moss, which they spread over the spruce brush. In this way they formed a bed large enough for the whole party, as soft as a hair mattress, and as good as anything can be for the repose of a weary frame. This completed their work, and it was not yet sundown. They had worked nobly; and when they stood out on the platform, and regarded their handiwork, their delight burst forth in ringing cheers. And now Phil claimed the hatchet, so as to carry out his cherished purpose of forming a signal staff. The others all went up to watch him at his work. Phil climbed up without any difficulty, and began at the upper branches, cutting away on a level with his waist, and using the lower ones to stand on. Phil was skilful with his hatchet; the branches were not large, and came tumbling down, beneath his strokes, with great rapidity. These the boys below gathered together, and heaped up in a pile, at a sufficient distance off to burn without injury to the signal staff, and yet in such a situation that any flame would be conspicuous to those on the sea. The work was soon accomplished; the last branch fell, and Phil descended to the ground. Where the tree had lately been there now arose a tall staff, naked, and ready to bear at its summit a red shirt, a pair of trousers, or anything else which the fancy of Phil might suggest as suitable to the place and the occasion.