It is very possible, by the Art of Chemistry, to extract from Hay all the separate Salts, Spirits, &c. of which it is composed. Now in a Chymical Preparation, there is always something left behind in the Still, out of which it is impossible to extract any more Juices; that the Chymists call Caput Mortuum. This Caput Mortuum is of no Service, and is entirely void of all those Salts and Spirits with which every other Substance on the Surface of the Earth abounds more or less. The Sun acts upon Bodies much in the Nature of a Still. He, by his Heat, causes the Vapours of all Kinds, which any Substance contains, to ascend out of their Residences into the Atmosphere, to some little Height, from whence either the Wind carries them, if there is any, or if there is no Wind, they fall down again Upon the Earth by their own Weight, at Sun-set, and are what is called Dew. Since this is the Case, and the Sun acts upon Bodies in the same Manner as a Still, we should take Care not to make Caput Mortuum of our Hay, by exposing it too long to his Rays; for by that Means we shall extract from it most of those Salts Spirits of which Food must consist, and of which all Animal Substance is composed. The Botanists are sensible of this: When they dry their Herbs, they lay them in a Place where no Sun can come to them, well knowing that too much Sun would take off their Flavour, and render them unfit for their different Physical Uses. Not that Hay would be made so well without Sun, on Account of the Largeness of the Quantity, and at the same Time it ought to be dryed enough, and no more than enough; for it is as easy to roast Hay too much as a Piece of Meat. * * * * * VIII. _That the Violin is a wanton Instrument, and not proper for Psalms; and that the Organ is not proper for Country-Dances, and brisk Airs._ This Error is entirely owing to Prejudice. The Violin being a light, small Instrument, easy of Conveyance, and withal much played upon in England, and at the same Time being powerful and capable of any Expression which the Performer pleases to give it, is commonly made Use of at Balls and Assemblies; by which Means it has annexed the Idea of Merriment and Jollity to itself, in the Minds of those, who have been so happy as to be Caperers to those sprightly English Airs, called Country Dances. The Organ, on the other Hand, being not easily moved on Account of it's Size, and expensive on Account of the complicated Machinery which is necessary to the Construction of it, is not convenient for Country Dances; and at the same Time being loud, capable of playing full Pieces of Music, Choruses, Services, &c. is made Use of in most Churches where the Inhabitants can afford to purchase this fine Instrument.