Inclos’d I send you a Copy of a Letter to Sir Joseph Banks, concerning the Balloons that at present occasion much Conversation here. I imagine that if you make one, and fill it with inflammable Air, you will continue to fire it by Electricity when it is up, and by that means match in Report the Thunder of Nature.

To morrow is to be signed our Definitive Treaty, which establishes for the present the Peace of Europe and America. Long, long, may it continue! Adieu. Yours most affectionately,