The name of jalap is derived from Xalapa, a town in South America, situated betwixt Vera Cruz and Mexico, where the plant, of which it is the root, was originally discovered, and whence it has been imported, in great quantities, into Europe. The jalap plant is now cultivated in the botanical garden at Charlestown, and in several other parts of America. When recent, the root is large, whitish, and full of juice; but, when dried, the best pieces are compact, hard, weighty, and of dark colour, with black circular marks. Both in smell and taste it is very nauseous. It is frequently mixed with slices of bryony root; but these are easily distinguished by their paler colour and porous texture.
The only mode in which this root is of use is as a medicine; and it is administered in substance, in a tincture, and an extract. It has been advantageously employed in several disorders; but, as it is very powerful in its effects, great caution is necessary in the use of it, particularly with children.
62. PERUVIAN BARK is the produce of a tree which grows in South America, and chiefly in Peru, whence its name has been derived.
This tree (Cinchona officinalis), in size and general appearance, somewhat resembles our cherry-tree. Its leaves are in pairs, oval, pointed, nerved, and smooth on the upper side; and the flowers hang in loose clusters, are fringed at the edges, and red in the inside (Fig. 10.)
Formerly this valuable medicine had the name of Jesuit's bark, from its having been first introduced into Europe by some persons of the religious order called Jesuits, that were settled in South America. They had been instructed in the use of it by the inhabitants of Peru, to whom it had long been known; and it continued, for many years, to be a lucrative article of commerce to them. For its officinal name of cinchona it was indebted to the lady of a Spanish Viceroy, the Countess del Cinchon, who, about 170 years ago, derived great benefit from taking it.
The tree from which it is obtained grows spontaneously, and in great abundance, in several of the mountainous forests of Quito and Peru. The proper time for cutting it is from September to November, the only season during which there is any considerable intermission from rain. The Indians, as soon as they have discovered a spot where the trees are in sufficient number, build a few huts for themselves, and one large hut for containing the bark, to preserve it from wet. They then go forth, each furnished with a large knife, and a bag which will hold about fifty pounds' weight of bark. Each tree occupies two men. They first cut or slice down the bark as far from the ground as they can reach. They then tie to the tree several sticks a little distance apart, and each about half a yard in length, to serve as a ladder by which they can ascend to the upper part, always slicing off the bark as far as they can reach, before they fix a new step. In this manner one of the two mounts to the top, whilst the man below collects what his companion cuts. To relieve each other, they ascend the different trees by turns; and they are generally able to fill their bags once in the course of the day. When they return to their huts, they spread out the bark to dry, and they are very careful to preserve it from wet, which would greatly injure it.
There are three sorts of bark in use: the pale, the red, and the yellow. Of these the two last have recently been discovered. The red is now very scarce, and is seldom brought into Europe. The pale bark is imported, from the Spanish Main, in large bundles, closely packed in goat or other skins. The yellow is in much larger pieces, and flatter and thicker than those of the pale bark.
We are informed, by some writers, that the Peruvians first learned the use of this bark from observing certain animals, affected with intermittent fevers, instinctively led to it. Others say that one of the inhabitants of Peru, having an ague, was cured by drinking the water of a pool into which some trees of this kind had accidentally fallen. On its first introduction into Europe, its use was opposed by many eminent physicians; and, for a long time afterwards, it was believed to be a very dangerous remedy. Its character, however, in process of time, became perfectly established, and it is now considered one of the most valuable medicines we possess.
Peruvian bark is used as a remedy in intermittent fevers or agues; and, by some persons, is prescribed in other kinds of fevers, in confluent small-pox, in gangrenous sore throat, and indeed in every species of gangrene. It is given in powder, as an extract, a spirituous tincture, and a decoction; but the most efficacious form is that of powder. In taste it is bitter and astringent, leaving an impression upon the palate which continues for some time afterwards; but its smell is rather agreeable than otherwise.
63. COFFEE is the seed of an evergreen shrub which is cultivated in hot climates, and is chiefly imported from Arabia and the East and West Indies.