The American Philosophical Society, the oldest learned society in the United States, was founded by Benjamin Franklin in 1743. By 1746, however, it was no longer functioning and was not revived until 1769 when it was merged with the American Society for Promoting Useful Knowledge.1
Thomas Jefferson was elected to the APS in January 1780 and the following year was elected a Counsellor. In his letter to Timothy Matlack, secretary of the Society, accepting this new position he expressed a desire "... to contribute any thing worthy the acceptance of the society."2 At that time, Jefferson was compiling data on the state of Virginia in answer to a questionnaire from the secretary of the French Legation, as the French sought to gather more information on the various states of this new republic they were supporting against England. In December of 1781, Jefferson wrote to fellow APS member, Charles Thomson, "In framing answers to some queries which Monsr. de Marbois sent me, it occurred to me that some of the subjects which I had then occasion to take up, might, if more fully handled, be a proper tribute to the Philosophical society."3 In a return letter Charles Thomson noted, "This Country opens to the philosophic view an extensive, rich and unexplored field," and encouraged Jefferson in his "philosophical researches."4 With the added motivation of making a contribution to the philosophical society, Jefferson's answers to Marbois's twenty-two questions on his native state grew into his only published book, Notes on the State of Virginia.
During his long association with the APS, Jefferson served on many committees. He chaired the committee to study the hessian fly, which was doing great damage to the American grain industry. When he made his "botanical" tour of the Northern Lakes with James Madison in 1791, his most lengthy journal entries resulting from that tour were on the hessian fly.5 But despite these notes and several meetings of his committee, a final resolution was never presented to the APS.6 Jefferson served also on a committee referred to in the Society Minutes of June 16, 1797, as the "Bone Committee" (more often referred to as the Antiquarian Committee) which had as a priority "to procure one or more entire skeletons of the Mammoth."7 In 1807, when he financed William Clark to head a dig at Big Bone Lick, Kentucky, of the over 300 bones that Clark shipped back, Jefferson offered to the APS fossils not already in their collection.8
On March 3, 1797, Jefferson was installed as president of the American Philosophical Society, and on the following day as vice president of the United States. He would serve as the Society's president for the next eighteen years, even though he offered his letter of resignation on three different occasions, when the government moved from Philadelphia to Washington, and then when retirement to Monticello moved him an even greater distance from the "seat of the meetings."11 The Society refused his offers of resignation and the minutes indicate that Jefferson remained active through correspondence even though the last entry listing Jefferson present at a meeting was May 2, 1800. The Society finally accepted his resignation at the meeting of January 20, 1815, "with great reluctance."12 Following Jefferson's death on July 4, 1826, members of the APS voted that the president's chair, which Jefferson had occupied for so many years, be draped in black for six months. The official eulogy was delivered before the Society by Nicholas Biddle on April 11, 1827.13