Panels, for which various woods have been used in various countries, and at various times, but always selected with care, to obviate as far as possible the alternate giving and contracting to which by their nature they are subject, are now rarely used for pictures larger than the cabinetsize. These latter, when the wood is old, well seasoned, and hard, do not require the same precautions that have always been thought nessecary for larger panels. Though, where the wood is of great hardness and very fine grain, the panel may be painted on at once, it usually undergoes a preparation, which, as in canvas, we call its ground or the priming. Thus prepared, it is to be had, of the various sizes now in use, at all the colorshops.,