[ADAMS, JOHN, 1735-1826, President]. Printed broadside signed in type by Adams as President and by Timothy Pickering as Secretary of State: By the President Of the United States of America. A Proclamation. As no truth is more clearly taught in the volume of inspiration...[calling for a day of prayer and thanksgiving], [Philadelphia, 6 March 1799]. 1 page, folio, 340 x 208mm. (13 1/4 x 8 1/8 in.), upper margin worn with two small holes (not affecting text). Shipton and Mooney 36497 (citing only the American Antiquarian Society copy). A rare broadside in which President Adams sets 25 April aside for a day of public prayer and thanksgiving (in view of the crisis of the Quasi-War with France), proclaiming that "the most precious interests of the United States are still in jeopardy," and asking God to "bless our armaments by land and by sea," but "put an end to the effusion of human blood." VERSO WITH AUTOGRAPH FREE FRANK OF TIMOTHY PICKERING, SECRETARY OF STATE, addressed in another's hand to "The Reverend Benj. Trumbull North Haven." RARE.