The intention of the present work is not to present at this time a view of the whole subject of pictography, though the writer has been preparing materials with a reference to that more ambitious project. The paper is limited to the presentation of the most important known pictographs of the North American Indians, with such classification as has been found convenient to the writer, and, for that reason, may be so to collaborators. The scheme of the paper has been to give very simply one or more examples, with illustrations, in connection with each one of the headings or titles of the classifications designated. This plan has involved a considerable amount of cross reference, because, in many cases, a character, or a group of characters, could be considered with reference to a number of noticeable characteristics, and it was a question of choice under which one of the headings it should be presented, involving reference to it from the other divisions of the paper. An amount of space disproportionate to the mere subdivision of Time under the class of Mnemonics, is occupied by the Dakota Winter Counts, but it is not believed that any apology is necessary for their full presentation, as they not only exhibit the device mentioned in reference to their use as calendars, but furnish a repertory for all points connected with the graphic portrayal of ideas. Attention is invited to the employment of the heraldic scheme of designating colors by lines, dots, etc., in those instances in the illustrations where color appeared to have significance, while it was not practicable to produce the coloration of the originals. In many cases, however, the figures are too minute to permit the successful use of that scheme, and the text must be referred to for explanation. Thanks are due and rendered for valuable assistance to correspondents and especially to officers of the Bureau of Ethnology and the United States Geological Survey, whose names are generally mentioned in connection with their several contributions. Acknowledgment is also made now and throughout the paper to Dr. W. J. Hoffman who has officially assisted the present writer during several years by researches in the field, and by drawing nearly all the illustrations presented. DISTRIBUTION OF PETROGLYPHS IN NORTH AMERICA. Etchings or paintings on rocks in North America are distributed generally. They are found throughout the extent of the continent, on bowlders formed by the sea waves or polished by ice of the glacial epoch; on the faces of rock ledges adjoining streams; on the high walls of cañons and cliffs; on the sides and roofs of caves; in short, wherever smooth surfaces of rock appear. Drawings have also been discovered on stones deposited in mounds and caves. Yet while these records are so frequent, there are localities to be distinguished in which they are especially abundant and noticeable. Also they differ markedly in character of execution and apparent subject-matter.