It is believed that, in the pictographs of all of these peoples discovered before the chart mentioned, the obvious intention was either historical or biographical, or more generally was to chronicle occurrences as such, and that there was not an apparent design to portray events selected without exclusive reference to their intrinsic interest or importance, but because they severally occurred within regular successive intervals of time, and to arrange them in an orderly form, specially convenient for use as a calendar and valuable for no other purpose. The copy made by Lieutenant Reed was traced over a duplicate of the original, which latter was drawn on a buffalo robe by Lone-Dog, an aged Indian, belonging to the Yanktonai tribe of the Dakotas, who in the autumn of 1876 was near Fort Peck, Montana, and was reported to be still in his possession. His Dakota name is given him by correspondents who knew him, as in the ordinary English literation, Shunka-ishnala, the words respectively corresponding very nearly with the vocables in Riggs’s lexicon for dog-lone. Others have, however, identified him as Chi-no-sa, translated as “a lone wanderer,” and asserted that he was at the time mentioned with the hostile Dakotas under Sitting Bull. There appear to have been several Dakotas of the present generation known to the whites as Lone-Dog. Plate VI is a representation of the chart as it would appear on the buffalo robe, but it is photographed from the copy on linen cloth, not directly from the robe. The duplicate from which the copy was immediately taken was in the possession of Basil Clément, a half-breed interpreter, living at Little Bend, near Fort Sully, Dakota, who professed to have obtained information concerning the chart from personal inquiries of many Indians, and whose dictated translation of them, reduced to writing in his own words, forms the basis of that given in the present paper. The genuineness of the document was verified by separate examination, through another interpreter, of the most intelligent Indians accessible at Fort Rice, and at a considerable distance from Clément, who could have had no recent communication with those so examined. One of the latter, named Good-Wood, a Blackfoot Dakota and an enlisted scout attached to the garrison at Fort Rice, immediately recognized the copy now in possession of the writer as “the same thing Lone-Dog had,” and also stated that he had seen another copy at Standing Rock Agency in the hands of Blue-Thunder, a Blackfoot Dakota. He said it showed “something put down for every year about their nation.” He knew how to use it as a calendar, beginning from the center and counting from right to left, and was familiar with the meaning of many of the later characters and the events they commemorated, in which he corroborated Clément’s translation, but explained that he had forgotten the interpretation of some of the earlier signs, which were about those things done before his birth.