the canyon has all the appearance of a young stream. In places the stream is dammed for irrigation and div[illegible] in the center. Most I can project one sees in the valley of the Laja on upper level above the present stream bed say 75 feet. The stream has cut down through this upper gully very recently. At Chirimoza we have again out of the valley of the Laja and are on a great mesa bounded on the north by mountains and on the east by low hills of lava. Here and there on this mesa are now shallow pools of water. This mesa is as flat to the eye as a table. Here also in places one down to drive water for irrigation. At the station Villa Reyes, to the north, an high [illegible] (100') of polished lava. The columns stand out well. Took three pictures. Arrived a little late about 12 noon at San Luis Potosi. Spent the afternoon looking about town and also visited the silver smelting works at Morelos. This very large concern is to the west of the city and just lava flows. From here we got a fine view of San Luis Potosi. Took 8 pictures of street scenes and market scenes.