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Updated: May 2, 2025
A Prussian astronomer, in the year 1781, observed that the 964th star of Mayer's catalogue was missing: and the calculations now prove that at the time Mayer saw his 964th star, the planet Herschel should have been precisely in the place where he noted that star. I shall send you also a little publication here, called the Bibliothèque Physico-oeconomique.
I have long deferred doing myself the honor of writing to you, wishing for an opportunity to accompany my letter with a copy of the Bibliothèque Physico-oeconomique, a book published here lately in four small volumes, and which gives an account of all the improvements in the arts which have been made for some years past. I flatter myself you will find in it many things agreeable and useful.
These are the Bibliothèque Physico-oeconomique, which will give you most of the late improvements in the arts; the Connoissance des Terns for 1786 and 1787, which is as late as they are published; and some pieces on air and fire, wherein you will find all the discoveries hitherto made on these subjects.
When speaking of the Bibliothèque Physico-oeconomique, T should have observed, that since its publication, a man in this city has invented a method of moving a vessel on the water, by a machine worked within the vessel. I went to see it. He did not know himself the principle of his own invention.
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