Davis 1946 34. 4 mi. W of Salzar, 9500 ft, Mexico, Mex., to Temescaltepec, Mexico, Mex. July 27, 1946 of 11,300 ft. No detailed notes were taken en route, so I will not set down any detailed observations on the trip at this point. However, the vegetational zoning seemed much the same as on Popocatepetl, i.e. going from lower to higher altitudes, long-needle pines, mixed long-needle pines & fir, pure fir, or nearly pure, and finally short leaf pines, with a few large oaks near the crest. The road runs for some miles at an elevation of 11,000 ft+ plus, and then drops abruptly into a large north-south valley which is walled off on all sides save the west by high, coniferous ridges. The road drops all the way down through the valley, and towards the southwest corner leads down a narrow steep-walled canyon to Real de Arriba, at 5850 ft., & thence to Temascaltepec, at 5500 ft. The vegetation in this canyon is a weird melange of oak, pine, alder & willows along the Rio Temescaltepec in the canyon floor, junipers, and numerous patches of bananas. There is some tree-yucca and tuna cactus, and a few maguey hedgerows about the pastures & corn fields.