-Ordinary paper is of course not suited for oil painting, as the oils and vehicles become absorbed, and the paint will not become attached to it. The prepared paper known as "oil sketching paper" is, however, perhaps the most convenient and economical ground for out-door sketching. It can be obtained finished with a smooth surface or with a grain in exact imitation of canvas. For touring it will be found very portable, especially in the form of a sketching "block" composed of a number of sheets compressed together, each sheet being removed as used without disturbing the rest.,,