After a while I grew weary of it as too painful, and again used my winged Messengers, upon the Shore, about the Mouth of our River, I found Store of a kind of wild Swans feeding upon Prey, both of Fish and Birds, and which is more strange; having one Claw like an Eagle, and the other like a Swan. These Birds breeding here in infinite Numbers, I took thirty or forty of them young, and bred them up by Hand for Recreation; yet not without some Thoughts of that Experiment which I after put in Practice. These being strong and able to continue a great Flight, I taught them first to come at Call afar off, not using any Noise, but only shewing them a white Cloth; and here I found it true what Plutarch affirms, That Creatures which eat Flesh are more docible than others. 'Tis wonderful to think what Tricks I taught them ere they were a Quarter old, amongst others I used them by Degrees to fly with Burdens, wherein I found them able beyond Belief, and a white Sheet being displayed to them by _Diego_, upon the Side of a Hill, they would carry from me to him Bread, Flesh, or whatever I pleased, and upon the like Calf come to me again. Having proceeded thus far, I consulted how to join a Number of them together, so as to carry a heavier Weight, which if I could compass, I might enable a Man to be carried safely in the Air from one Place to another. I puzzled my Wits extremely with this Thought, and upon Trial found, that if many were put to the bearing of one great Burthen, by reason it was impossible all of them, should rise together just at one Instant, the first that rise finding himself stayed by a Weight heavier than he could stir, would soon give over, and so the second, third, and all the rest. I contrived at last a Way whereby each might rise with only his own Proportion of Weight, I fastened about each _Gansa_ a little Pulley of Cork, and putting a String of a just Length through it, I fastened one End to a Block of almost eight Pounds Weight, and tied a two Pound Weight to the other End of the String, and then causing the Signal to be erected, they all arose together, being four in Number, and carried away my Block to the Place appointed. This hitting so luckily, I added two or three Birds more, and made Trial of their carrying a Lamb, whose Happiness I much envied, that he should be the first living Creature to partake of such an excellent Device.