The mine countries are all so cold and barren, that the inhabitants have to procure most of their provisions from the coast; this is caused by the exhalations of salts and sulphur from the earth, which destroy the growth of all vegetables. These are so stifling to the Spaniards who dwell about the mines, that they are obliged often to drink the _mattea_, or tea made of the herb _camini_, to moisten their mouths. The mules also, that trip it nimbly over the mountains, are forced to walk slowly in the country about the mines, and have often to stop to take breath. If these vapours are so strong without and in the open air, what must they be within the bowels of the earth in the mines, into which, if a fresh man go, he is suddenly benumbed with pain. This is the case with many, but seldom lasts above a day, and they are not liable to be affected a second time: Yet vapours often burst forth suddenly, by which the workmen are killed on the spot; and one way or another, great multitudes of Indians die in working the mines. One is apt to wonder that, through all this part of the world, those districts which are most barren and unwholesome are the best inhabited; while other places, that seem to vie with our nations of the terrestrial paradise, in beauty and fertility, are but thinly peopled. Yet, when one considers, that it is the thirst of wealth, not the love of ease, which attracts people thither, the wonder ceases, and we see how much the hope of living rich gets the better even of the hope of living; as if the sole end for which man was created was to acquire wealth, at the expence of health and happiness. In reference to these deserts, the following observation occurs to my memory, as having happened when we were on the road to Piura. When we lay down to sleep at night, our mules went eagerly in search of a certain root, not unlike a parsnip, but much bigger, which contains a great deal of juice, and, besides serving as food, often answers as a substitute for water in the deserts. When the mules find these, and are unable to rake them out of the ground with their feet, they stand over them and bray with all their might, till the Indians come to their assistance.