By the President of the United States of America
A Proclamation
Whereas the Congress of the United States, "in honor of the memory of General George Washington,” have this day "Resolved, That it be recommended to the people of the United States to wear crape on the left arm as mourning for thirty days,” and "that the President of the United States be requested to issue a proclamation notifying to the people throughout the United States the said recommendation:”
Now, therefore, I, John Adams, President of the United States, do hereby proclaim the same accordingly.
Given under my hand and the seal of the United States, at Philadelphia, the 24th day of December, A.D. 1799, and of the Independence of the United States the twenty-fourth.

JOHN ADAMS
By the President:
Timothy Pickering, Secretary of State.
Source: Messages and Papers of the Presidents, 1789-1897, Volume X, James D. Richardson, ed., p 79.
John Adams, Proclamation—Death of George Washington Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/379165