So saying, I measured out a certain distance from the base of the tree and marked the spot, and then by means of a rod whose length I knew, and imaginary lines, I calculated the angle subtended by the trunk of the tree from the ground to the root of the branch. This done, I was able to discover the height required, and, to the astonishment of the younger children, announced that we should henceforth live thirty feet above the ground. This I wanted to know, that I might construct a ladder of the necessary length. Telling Fritz to collect all our cord, and the others to roll all the twine into a ball, I sat down, and taking the reeds, speedily manufactured half a dozen arrows and feathered them from the dead flamingo. I then took a strong bamboo, bent it, and strung it so as to form a bow. When the boys saw what I had done they were delighted, and begged to have the pleasure of firing the first shot. "No, no!" said I, "I did not make this for mere pleasure, nor is it even intended as a weapon; the arrows are pointless. Elizabeth," I continued to my wife, "can you supply me with a ball of stout thread from your wonderful bag?" "Certainly," replied she, "I think a ball of thread was the first thing to enter the bag," and diving her hand deep in, she drew out the very thing I wanted. "Now, boys," I said, "I am going to fire the first shot," and I fastened one end of the thread to one of my arrows and aimed at a large branch above me. The arrow flew upward and bore the thread over the branch and fell at our feet. Thus was the first step in our undertaking accomplished. Now for the rope ladder! Fritz had obtained two coils of cord, each about forty feet in length; these we stretched on the ground side by side; then Fritz cut the bamboos into pieces of two feet for the steps of the ladder, and as he handed them to me, I passed them through knots which I had prepared in the ropes, while Jack fixed each end with a nail driven through the wood. When the ladder was finished, I carried over the bough a rope by which it might be hauled up. This done, I fixed the lower end of the ladder firmly to the ground by means of stakes, and all was ready for an ascent. The boys, who had been watching me with intense interest, were each eager to be first. "Jack shall have the honor," said I, "as he is the lightest; so up with you, my boy, and do not break your neck." Jack, who was as active as a monkey, sprang up the ladder and quickly gained the top. "Three cheers for the nest!" he exclaimed, waving his cap. "Hurrah, hurrah, hurrah for our jolly nest! What a grand house we will have up here; come along, Fritz!"