Letter to Monsieur Dubourg, 10 March 1773 : on the analogy between magnetism and electricity. From: Memoirs of the life and writings of Benjamin Franklin ... / written by himself to a late period; and continued to the time of his death by the grandson, William Temple Franklin; comprising the private correspondence and public negociations [sic] of Dr. Franklin and his select political, philosophical, and miscellaneous works, published from the original mss. Second edition. London: Printed for Henry Colburn, 1818-1819.