Benjamin Franklin to Cadwallader Colden, August 27, 1747

Philada. Augt. 27. 1747

Sir

This just serves to enclose you a Letter from our Friend Bertram; 7 and to request you would deliver my Papers on Electricity to the Bearer Mr. Darling. 8 I have not Time to add, but that I am, with great Respect, Sir, Your most humble Servant

B Franklin

P.S . I think you wrote me Word you had lent Watson’s Book on Electricity 9 which I sent you last Winter to Dr. Bard. 1 Please to direct Mr. Darling to Dr. Bard’s for it, if he has not return’d it to you.