Pictographs, when of bright colors and upon a light-colored surface, may readily be traced upon tracing linen, such as is employed by topographers. Should the rock be of a dark color, and the characters indistinct, a simple process is to first follow the pictographic characters in outline with colored crayons, red chalk, or dry colors mixed with water and applied with a brush, after which a piece of muslin is placed over the surface and pressed so as to receive sufficient coloring matter to indicate the general form and relative positions of the characters. After these impressions are touched up the true position may be obtained by painting the lines upon the back of the sheet of muslin, or by making a true tracing of the negative. A mode of securing the outline once adopted was to clear out the channels of the intaglios, then, after painting them heavily, to press a sheet of muslin into the freshly-painted depressions. The objection to this method is the obvious damage inflicted on the inscription. Before such treatment, if the only one practicable, all particulars of the work to be covered by paint should be carefully recorded. The locality should be reported with detail of State (or Territory), county, township, and distance and direction from the nearest post-office, railway station or country road. In addition the name of any contiguous stream, hill, bluff, or other remarkable natural feature should be given. The name of the owner of the land is of some secondary value, but that indication is liable to frequent changes. The site or station should be particularly described with reference to the surrounding country and to the natural circumstances and geological history of the location. When numbers and groups of petroglyphs or rock paintings occur, their relation to each other, to the points of the compass, or to topographical features should be noted, if possible, by an accurate survey, otherwise by numeration and sketching. The following details should be carefully noted: The direction of the face of the rock. The presence of probable trails and gaps which may have been used in shortening distances in travel. Localities of mounds and caves, if any, in the vicinity. Ancient camping grounds, indicated by fragments of pottery, flint chips, etc. Existence of aboriginal relics, particularly flints which may have been used in pecking; these may be found at the base of the rocks upon which petroglyphs occur. The presence of small mortar-holes which may have served in the preparation of colors. With reference to pictographs on other objects than rock the material upon which they appear and the substances used in their execution should be reported, as indicated in another part of this paper.