These illustrations, as well as other pictographs on the same rock, not at present submitted, bear remarkable resemblance to the general type of Shoshonian drawing, and from such evidence as is now attainable it appears more than probable that they are of Chemehuevi origin, as that tribe at one time ranged thus far west, though north of the mountains, and also visited the valley and settlements at Los Angeles at stated intervals to trade. It is also known that the Mojaves came at stated periods to Los Angeles as late as 1845, and the trail indicated at point _a_ of the map would appear to have been their most practicable and convenient route. There is strong evidence that the Mokis sometimes visited the Pacific coast and might readily have taken this same course, marking the important portion of the route by drawings in the nature of guide boards. CHARTS OF GEOGRAPHIC FEATURES. Dr. W. J. Hoffman states that when at Grapevine Springs, Nevada, in 1871, the Pai-Uta living at that locality informed the party of the exact location of Las Vegas, the objective point. The Indian sat upon the sand, and with the palms of his hands formed an oblong ridge to represent Spring Mountain, and southeast of this ridge another gradual slope, terminating on the eastern side more abruptly; over the latter he passed his fingers to represent the side valleys running eastward. He then took a stick and showed the direction of the old Spanish trail running east and west over the lower portion of the last-named ridge. When this was completed the Indian looked at the members of the party, and with a mixture of English, Spanish, Pai-Uta, and gesture signs, told them that from where they were now they would have to go southward, east of Spring Mountain, to the camp of Pai-Uta Charlie, where they would have to sleep; then indicating a line southeastward to another spring (Stump’s) to complete the second day; then he followed the line representing the Spanish trail to the east of the divide of the second ridge above named, where he left it, and passing northward to the first valley, he thrust the short stick into the ground and said, “Las Vegas.” It is needless to say that the information was found to be correct and of considerable value to the party. Schoolcraft (Vol. I, p. 334, Pl. 47, Fig. B) mentions that the discovery, on one of the tributaries of the Susquehanna River, “of an Indian map drawn on stone, with intermixed devices, a copy of which appears in the first volume of the collections of the Historical Committee of the American Philosophical Society, Philadelphia, proves, although it is thus far isolated, that stone was also employed in that branch of inscription. This discovery was in the area occupied by the Lenapees, who are known to have practiced the art, which they called Ola Walum.”