The entire matter embraced in Nos. 3123 to 3154 is contributed by the eminent photographer, Mr. Geo. G. Rockwood, of New York.

3129. To Make a Photograph Without a Camera

3129.    To Make a Photograph Without a Camera. The art of photography has many interesting and useful applications other than portraiture, one of the simplest and most beautiful of which we here present. It can be applied to the copying of laces, drawings, leaves, or anything of a transparent or translucent nature. It is proposed to first describe the manipulations, and then give the formulae.

3130. Papier Saxe for Photography

3130.    Papier Saxe for Photography. The best is the papier saxe, an article made expressly for photography, and may bo obtained from any dealer in photographic materials. It is sold in sheets about 18 by 22 inches. The smooth side can bo easily selected, and upon that side the print should be made. Cut tho paper into the sizes most convenient for the stylo of picture desired, and prepare the salting solution as follows:

3131. Salting Solution for Photographic Paper

3131. Salting Solution for Photographic Paper. Mix together pure water, 16 ounces; chloride of ammonium or of sodium, 160 grains. Take enough of this to cover a shallow dish of porcelain to the depth of 1/2 inch or more, and then immerse the paper, one sheet at a time. "When a half dozen are in, turn them all over, and take them out one by one, in the order in which they were immersed, and hang them up separately to dry.

3132. Albumenized Paper for Photography

3132.    Albumenized Paper for Photography. Albumenized paper, such as is used for ordinary portraiture in the galleries, is always ready prepared for silvering. It is much the finest and sharpest in its results, and will usually he adopted; but the most artistic effects will be produced by the use of plain papier saxe. Paper, in either of these forms, prepared with chloride (salt) will keep indefinitely.

3133. Silver Solution to Sensatize Paper

3133.     Silver Solution to Sensatize Paper. The weather being propitious for printing (a clear, bright sunlight is preferable), the salted or albumenized paper is taken into a darkened room to be rendered sensitive by the silver solution. Make about the same quantity of this as of the salting solution, by using, in the following proportions: Pure water, 1 ounce; nitrate of silver (in crystals), 60 grains. "When thoroughly dissolved, pour the solution into a flat porcelain dish, and carefully remove all bubbles, etc..

3134. To Make the Paper Sensitive

3134.    To Make the Paper Sensitive. Having prepared the silver solution as above directed, take the paper by opposite corners, smooth side down if plain paper, glazed side if albumenized; lower one corner on to the solution, and steadily lower the rest to the surface of the solution, so that the air is completely driven out, and the entire surface exposed to the action of the silver. Be very careful that the solution does not get on the back of the paper. Plain paper (papier saxe) should float 2 minutes; albumenized, 3 minutes. Carefully raise the sheet from the solution, and hang up to dry in a perfectly dark room. It is best to proceed with the printing as soon as the paper is dry. Additional brilliancy and sensitiveness is imparted to the paper by exposing it, after it is thoroughly dry, to the fumes of ammonia. This may be done by hanging it up with a clip or pin in a close box, in which is a small dish containing aqua ammonia F.F.F. This fuming process may be dispensed with, yet the prints are much more uniform when treated with the ammonia.