Now, My dear General, that You are Going to Enjoy some Ease and Quiet, Permit me to propose a plan to you Which Might Become Greatly Beneficial to the Black part of Mankind—Let us Unite in Purchasing a small Estate Where We May try the Experiment to free the Negroes, and Use them only as tenants—Such an Example as Yours Might Render it a General Practice, and if We succeed in America, I Will chearfully devote a part of My time to Render the Method fascionable in the West indias—if it Be a Wild scheme, I Had Rather Be Mad that Way, than to Be thought Wise on the other tack.
Source: This is an Early Access document from The Papers of George Washington.
Letter from Washington to Lafayette, Headquarters Newburgh, April 5, 1783
The scheme my dear Marqs which you propose as a precedent, to encourage the emancipation of the black people of this country from the Bondage in wch they are held, is a striking evidence of the benevolence of your Heart. I shall be happy to join you in so laudable a work; but will defer going into a detail of the business, ’till I have the pleasure of seeing you.
Source: this is an Early Access document from The Papers of George Washington.
Letter from Lafayette to Washington, Paris, February 6, 1786
—an other Secret I intrust to you, my dear General, is that I Have purchased for Hundred And twenty five thousand French livres a plantation in the Colony of Cayenne and am going to free my Negroes in order to Make that Experiment which you know is My Hobby Horse.
Letter from Washington to Lafayette, Mount Vernon, May 10, 1786
The benevolence of your heart my Dr Marqs is so conspicuous upon all occasions, that I never wonder at any fresh proofs of it; but your late purchase of an Estate in the Colony of Cayenne with a view of emancipating the slaves on it, is a generous and noble proof of your humanity. Would to God a like spirit would diffuse itself generally into the minds of the people of this country, but I despair of seeing it—some petitions were presented to the Assembly at its last Session, for the abolition of slavery, but they could scarcely obtain a reading. To set them afloat at once would, I really believe, be productive of much inconvenience & mischief; but by degrees it certainly might, & assuredly ought to be effected & that too by Legislative authority.
Source: The Papers of George Washington, Confederation Series, vol. 4, 2 April 1786 – 31 January 1787, ed. W. W. Abbot. Charlottesville: University Press of Virginia, 1995, pp. 41–45.