As it is generally supposed that the Venetian masters owed much of the harmony, brightness and durability of their colouring to the preparation of their grounds for painting on, I here insert the mode of preparing that ground, according to the receipt of Sebastian Grandi, an Italian colour-grinder and maker, who received from the Society of Arts their honorary silver medal and a premium of fifty guineas. His several communications relative to the preparation of grounds were most respectably certified to the Society by Benjamin West, late President of the Royal Academy, Sir Thomas Lawrence, his successor, and the following Royal Academicians: John Opie, M.A. Shee, J.Northcote, J.Farington, Richard Cosway and P.J. de Loutherbourg, who all confirmed the good quality of the grounds prepared by Mr. Grandi. The materials are extremely cheap as well as easy to be procured, and none of the processes for preparing them are at all difficult.