I received your kind Letter of the 13th. Instant, acquainting me that the Royal Society have instructed you to present to me in their Name one of the Gold Medals they have struck in honour of Capt. Cook. I am extreamly sensible of this fresh Mark of their favourable Regard for me. They have always been very good to me, and I beg you would be pleased to offer them my thankful Acknowledgements. If you have not already had an Opportunity of forwarding it, it may be given to my Grandson, who will have the honour of delivering this to your hands. He is a worthy good young Man, and as such I beg leave to recommend him to your Civilities. He returns hither in a few Weeks.

I am to thank you, too, for the Share you had in procuring his Majesty’s Orders for sending me a Copy of Capt. Cook’s Voyage, thro’ Lord Howe. I receiv’d it safe: but by Mistake in packing, the first Volume was omitted, and a Duplicate of the third Volume put into the Box instead of it. I immediately return’d one of the 3d Vols. to M. Pissot, who promis’d to procure me the first in exchange, but I have not yet receiv’d it. I inclose a Letter to Lord Howe, expressing my thankful Acknowledgments for this very great Favour.

I am glad to find that Experiments with the Baloons begin to be made in England. It is only by a Number of Trials that the Practice of Constructing, Filling, and Managing them can be perfected, so as to produce some Utility: You have now with you, I hear, some of the best Artists in that Way from this Country; and I make no doubt but yours will soon acquire their Skill, and improve upon it.

We have been much amiss’d here for some time past with a pretended new Art of Healing by what is called Magnetisme Animale. The Professor of this Art has in a short Time made near twenty Thousand Louis d’ors by Teaching and Practicing it. The King appointed a Number of Commissaries to enquire into it, and was pleased to request my Joining them as one of the Academy of Science. I send you a Copy of our Report not yet publish’d. With sincere and great Esteem, I am, Dear Sir, Your most obedient and most obedient Servant