The glass for mounting, whether flat or convex, should be the same size as the picture. It should be dipped in water and permitted to drain off, but do not dry it; pour a little of the compound on the side against which the photograph is to be placed—the hollow side, if the glass is convex—let it drain off and lay the picture face down upon it. With the thumb and finger commence at the centre of the photograph, smoothing it down close to the glass, forcing all the air bubbles out to the edges, thus continuing until the picture is entirely smoothed out, and at every point in actual contact with the glass. During this process hold the glass at an angle, so that you can see if there are any air bubbles or glistening places in it by examining its face occasionally; and always let a little of the compound get on the back of the photograph, as it allows the fingers to glide over it more easily and lessens the chance of tearing it. Now take a second glass the same size as the first, and having thoroughly cleaned it, fasten it to the back of the other by small strips of gummed paper. Then place a piece of card-board of the same size on the back of the two glasses and fasten the three together also with small strips of gummed paper; finally securing the whole firmly together by binding it with some large strips, and your picture is ready to frame. In case you do not care to frame it, cut out a piece of some dark fancy paper, a quarter of an inch on each edge larger than the picture, and fasten it, dark side out, on the back, allowing the quarter of an inch to lap over and be pasted on the face, after which straighten the edges with a ruler and sharp knife.