But his happiness, and that of his family, depend on it. The most uninformed mind with a healthy body, is happier than the wisest valetudinarian. I need not tell you, that if I can be useful to you in any part of this, or any other plan you shall adopt, you will make me happy by commanding my services. Will you be so good, Sir, as to return my most respectful thanks for the diploma with which I am honored by the society instituted with you, for the encouragement of the study of Natural History. I am afraid it will never be in my power to contribute any thing to the object of the institution. Circumstances have thrown me into a very different line of life; and not choice, as I am happy to find in your case. In the year 1781, while confined to my room by a fall from my horse, I wrote some Notes, in answer to the inquiries of M. de Marbois, as to the natural and political state of Virginia. They were hasty and undigested: yet as some of these touch slightly on some objects of its natural history, I will take the liberty of asking the society to accept a copy of them. For the same reason, and because too, they touch on the political condition of our country, I will beg leave to present you with a copy, and ask the favor of you to find a conveyance for them, from London to Edinburgh. They are printed by Stockdale, bookseller, Piccadilly, and will be ready in three or four weeks from this time. I will direct him to deliver two copies to your order. Repeating, constantly, the proffer of my services, I shall only add assurances of the esteem and attachment, with which I am, Dear Sir, your friend and servant, Th: Jefferson. LETTER LXVIII.--TO STEPHEN CATHALAN, JUNIOR, July 21,1787 TO STEPHEN CATHALAN, JUNIOR. Paris, July 21,1787. Sir,