feet lower in level than the plateau, though in distance but a few miles off. Three or four thousand miles of latitude would not give a greater difference. It would never do to be late, and break our necks in one of the awkward water-courses that cut the plateau about in all directions; so we started homewards, soon having to unfasten great-coats and shawls from our saddles, to keep out the cold of the approaching sunset; and so we got back to the hospitable hacienda, and were glad to warm ourselves at the fire. Next morning, we went off to get a view of the great barranca of Regla. A ride over the hills brought us to a wood of oaks, with their branches fringed with the long grey Spanish moss, and a profusion of epiphytes clinging to their bark, some splendidly in flower, showing the fantastic shapes and brilliant colours one sees in English orchid-houses. Cactuses of many species complete the picture of the vegetation in this beautiful spot. This is at the top of the barranca. Then imagine a valley a mile or two in width, with sides almost perpendicular and capped with basaltic pillars, and at the bottom a strip of land where the vegetation is of the deepest green of the tropics, with a river winding along among palm-trees and bananas. This great barranca is between two and three thousand feet deep, and the view is wonderful. We went down a considerable way by a zig-zag road, my companion collecting armfuls of plants by the way, but unfortunately losing his thermometer, which could not be found, though a long hunt for it produced a great many more plants, and so the trouble was not wasted. The prickly pear was covered with ripe purple fruit a little way down, and we refreshed ourselves with them, I managing—in my clumsiness—to get into my fingers two or three of the little sheaves of needles which are planted on the outside of the fruit, and thus providing myself with occupation for leisure moments for three or four days after in taking them out. Many species of cactus, and the nopal, or prickly pear, especially, are full of watery sap, which trickles out in a stream when they are pierced. In these thirsty regions, when springs and brooks are dry, the cattle bite them to get at the moisture, regardless of the thorns. On the north coast of Africa the camels delight in crunching the juicy leaves of the same plant. I have often been amused in watching the camel-drivers’ efforts to get their trains of laden beasts along the narrow sandy lanes of Tangier, between hedges of prickly pears, where the camels with their long necks could reach the tempting lobes on both sides of the way. In this thirsty season, while the cattle in the Mexican plains derive moisture from the cactus, the aloe provides for man a substitute for water. It frequently happened to us to go from rancho to rancho asking for water in vain, though pulque was to be had in abundance.