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Sir, your letter of the 15th is received, but Age has long since obliged me to withhold my mind from Speculations of the difficulty of those of your letter, that there are means of artificial buoyancy by which man may be supported in the Air, the Balloon has proved, and that means of directing it may be discovered is against no law of Nature and is therefore possible as in the case of Birds, but to do this by mechanical means alone in a medium so rare and unassisting as air must have the aid of some principle not yet generally known. However, I can really give no opinion understandingly on the subject and with more good will than confidence wish to you success.

Thomas Jefferson
27 April, 1822