The Academy of Sciences, in such of their researches as are of a more difficult kind and a more sensible use, embrace the knowledge of nature and the improvements of the arts. We may presume that such profound, such uninterrupted pursuits as these, such exact calculations, such refined discoveries, such extensive and exalted views, will, at last, produce something that may prove of advantage to the universe. Hitherto, as we have observed together, the most useful discoveries have been made in the most barbarous times. One would conclude that the business of the most enlightened ages and the most learned bodies, is, to argue and debate on things which were invented by ignorant people. We know exactly the angle which the sail of a ship is to make with the keel in order to its sailing better; and yet Columbus discovered America without having the least idea of the property of this angle: however, I am far from inferring from hence that we are to confine ourselves merely to a blind practice, but happy it were, would naturalists and geometricians unite, as much as possible, the practice with the theory. Strange, but so it is, that those things which reflect the greatest honour on the human mind are frequently of the least benefit to it! A man who understands the four fundamental rules of arithmetic, aided by a little good sense, shall amass prodigious wealth in trade, shall become a Sir Peter Delme, a Sir Richard Hopkins, a Sir Gilbert Heathcote, whilst a poor algebraist spends his whole life in searching for astonishing properties and relations in numbers, which at the same time are of no manner of use, and will not acquaint him with the nature of exchanges. This is very nearly the case with most of the arts: there is a certain point beyond which all researches serve to no other purpose than merely to delight an inquisitive mind. Those ingenious and useless truths may be compared to stars which, by being placed at too great a distance, cannot afford us the least light.