1To Thomas Jefferson from Mary Barclay, 21 December 1807 (Jefferson Papers)
Presuming on the Friendship and Esteem you always professed for Mr Barclay, and the many proofs of it I have received Myself, I should have addressed a few lines to You by My Son, that he might have the advantage of being known to you, but My Illness prevented at his departure and till now, informing you of the Business he is gone on, in which I doubted not your aid as far as it could...