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.
It is generally understood that silver is the peculiar wealth of Peru, and the Spaniards usually talk of gold-mines as confined to Chili: Yet there are one or two _lavaderas_, or washing-places for gold in the south of Peru, near the frontiers of Chili. In 1709, two surprizingly large _pepitos_, or lumps of virgin gold, were found in one of these places, one of which weighed complete thirty-two pounds, and was purchased by the _Conde de Monclod_, then viceroy of Peru, and presented by him to the king of Spain. The other, shaped somewhat like an ox's heart, weighed twenty-two pounds and a half; and was purchased by the corregidor of Arica. In searching for these _lavadores_ or washing places, they dig in the corners of some little brook, where they judge, from certain tokens, that the grains of gold are lodged. To assist in carrying away the earth or mud, they let in a stream or current of water into the excavation, and keep stirring up the soil, that the water may carry it away. On reaching the golden sand, they turn the stream another way, and dig out this sand, which is carried on mules to certain ponds or basons, which are joined by small canals. Into these they introduce a smart stream of water, to loosen the earth and carry away the grosser part. The Indians stand in the basons or ponds, stirring up the earth to assist the operation of the water, and throwing out the stones. The gold remains at the bottom, still mixed with a black sand, and is hardly to be seen till farther cleaned and separated, which is easily done. These washing places differ much from each other. In some the grains of gold are as big as small shot; and in one belonging to the priests, near Valparaiso, some are found from the weight of two or three ounces to a pound and a half. This way of getting gold is much better than from the mines, as it does not require expensive digging, neither are mills necessary for grinding the ore, nor quicksilver for extracting the metal; so that both the trouble and expence are much less. The Creoles are by no means so nice in washing their gold as are the people in Europe; but great plenty makes them careless, both in this and other matters.