The stream pointed out to us the road we were to follow; along the edge of it, sheltered by the bushes and enlivened by the birds which were fluttering about the banks, we shaped our course. Sumichrast showed us some dahlias--the flower which would be so perfect if it only possessed a perfume. It is a perennial in Mexico, whence it has been imported into Europe, and there grows to a height of about three feet, producing only single flowers of a pale yellow color. By means of cultivation, varieties have been obtained with double flowers of a hundred different tints, which are such ornaments in our gardens. Many a Mexican, who imports dahlias at a great expense, has not the least idea that the plant is indigenous to his own soil. The roots of the dahlia, salted and boiled, are eaten by the Indians; it is a farinaceous food of a somewhat insipid taste. Certainly, the wild potato is not much better; and who can tell whether cultivation, after having enriched our gardens with its beautiful flowers, may not also furnish our tables with the bulbs of this plant rendered more succulent by horticulture. The course of the stream described numerous windings, and the desire of keeping on its margin frequently diverted us from our direct path; at last it doubled round short to the left, and I bade farewell to it as if to a friend, but, nevertheless, preserved a hope that its capricious course would again bring it back in our path. Our road now commenced to ascend, sometimes crossing glades or groves. Suddenly a wide prairie opened out before us, and Sumichrast led the way through its tall reeds. After a quarter of an hour's walking, our guide began to sneeze; Lucien followed his example, then came l'Encuerado's turn, and at last mine, and ultimately Gringalet's. These repeated salvos were received with shouts of laughter and "God bless you," often repeated; but a sharp tingling in the throat and eyes was soon added to the sneezing. "I say," cried my friend, "what does this joke mean?" I looked round me more carefully, and discovered that we were surrounded with euphorbia plants. But this mishap soon became a most serious affair, as the sneezing seemed as if it never would end, and our skin, eyes, and mouth commenced to burn as if in a fever. On this occasion we did not care even to construct a hut or light a fire, but were only too glad to lie down on the bare cold ground, and seek in sleep some respite from our sufferings. Lucien, although very exhausted, endured his sufferings with such courage as made me proud of him. Uncomplaining, he soon went off to sleep; but to myself and companions such a luxury was refused.