To prevent the colours from ever changing, and for preserving them in their original beauty, force, and vigour, the cloths should be primed with black made of burnt peach-stones, mixed with white: that is to say, the second going over the cloth, or the last hand, as it is termed, should be done with this black and white, and the picture will be fresh and without change to the last. -This was the general practice and advice of the late Mr. George Robertson, a landscape painter of first-rate abilities, whose memory will be ever respected.