Dinner was quickly dispatched, as we were all eager to continue our engineering work. A scheme had occurred to me for conveying one end of a plank across the water, and I set about it in this way. There fortunately were one or two trees close to the stream on either side. I attached a rope pretty near one end of a beam, and slung it loosely to the tree beside us; then, fastening a long rope to the other end, I crossed with it by means of broken rocks and stones, and having a pulley and block, I soon arranged the rope on a strong limb of the opposite tree, again returning with the end to our own side. Now putting my idea to the proof, I brought the ass and the cow, and fastening this rope to the harness I had previously contrived for them, I drove them steadily away from the bank. To my great satisfaction, and the surprise and delight of the boys, the end of the plank which had been laid alongside the stream began gently to move, rose higher, turned, and soon projecting over the water, continued to advance, until, having described the segment of a circle, it reached the opposite bank; I stopped my team, the plank rested on the ground, the bridge was made! So at least thought Fritz and Jack, who in a moment were lightly running across the narrow way, shouting joyfully as they sprang to the other side. Our work was now comparatively easy. A second and third plank were laid beside the first; and when these were carefully secured at each end to the ground and to the trees, we very quickly laid short boards side by side across the beams, the boys nailing them lightly down as I sawed them in lengths; and when this was done, our bridge was pronounced complete. Nothing could exceed the excitement of the children. They danced to and fro on the wonderful structure, singing, shouting, and cutting the wildest capers. I must confess I heartily sympathized with their triumphant feelings. Now that the work was done, we began to feel how much we were fatigued, and gladly returned to our tent for refreshment and repose. Next morning, while we breakfasted, I made a little speech to my sons on the subject of the important move we were about to make, wishing to impress them with a sense of the absolute necessity of great caution. "Remember," said I, "that, although you all begin to feel very much at your ease here, we are yet complete strangers to a variety of dangers which may surprise us unawares. I charge you, therefore, to maintain good order, and keep together on the march. No darting off into by-ways, Jack. No lingering behind to philosophize, Ernest. And now all hands to work."