Schoolcraft, who has been more explicit than other writers respecting the picture-writings of the North American Indians, speaks of two distinct pictographic systems among the Algonkin tribes, called by them respectively _Kekeewin_ and _Kekeenowin_. The first appeared to be their method of recording facts of every-day occurrence, and embraced the heraldic devices used upon the grave posts--the communications written upon birch bark, and the caution marks, itinerary, hunting, and war records inscribed upon the trunks of blazed trees by travelling bands, to communicate intelligence to their comrades in the forest. These writings, the signs of which were carefully taught to the young, like the language of signs common at present to a majority of the Western tribes, could be understood by any Indian. Loskiel, the Moravian missionary, who makes frequent mention of picture records, states that "it gave the Indians great pleasure if one halted on coming to such a tree, and listened to their description of the great chief and his exploits thereon inscribed." The Kekeenowin, on the other hand,--the pictographic system of the prophets, jugglers, and medicine-men,--was far less generally understood by the Indians themselves. It was the method used in the historical records, sung before the tribe at religious feasts and dances, and was likewise invariably employed in the incantations of the priests, prophets, and medicine-men, of which Schoolcraft gives seven kinds relating to medicine, necromancy, revelry, hunting, prophecy, war, and love. The chief characteristic of the Kekeenowin is the fact that in it each symbol recalled to the mind of the reader learned in the art a song, previously committed to memory by him in connection with the symbol, and the general idea of which was more or less arbitrarily connected with it. "The words of the song," says James, in his appendix to Tanner's narrative, "were not variable, but must be learned by heart, otherwise though from an inspection of the figure the idea might be comprehended, no one would know what to sing." The main object, however, was the preservation of the songs, which the priests, on consulting their birch-bark scrolls or painted wooden tablets, were thus enabled to sing at the great feasts, giving the many verses in their proper order. The connection between the symbol and the idea expressed by the song was often beyond the power of divination to the uninitiated, and the key to these sacred incantations, a knowledge of the songs, once lost, could never be recovered, as it was doubtless far from the intention of the priests that the uninitiated Indian should divine their mysteries from an inspection of the symbols. It was only upon the payment of many beaver skins, says Tanner in his narrative, that he was permitted to learn the mystic signification of the twenty-seven symbols of the Chippeway song for medicine hunting, which it took him more than a year to learn.