A series of trials made recently in Paris proved that cordage manufactured from the fibre of this plant grown in Algiers, was far preferable in comparative strength to that manufactured from hemp. Cables, of equal size, showed that that made of the aloe raised a weight of one-fifth more than that of hemp.
The drug is imported into this country under the names of Socotrine, East Indian or Hepatic, Barbados, Cape and Caballine aloes. It contains a substance called Aloetine, which some regard as its active principle. The various species now defined are—Aloe spicata, vulgaris, Socotrina, Indica, rubescens, Arabica, linguæ-formis and Commelina. The average imports in 1841 and 1842 were only about 170,780 cwts.; it is now much larger, and a great portion of the supply is drawn from the Cape colony.
The mode of preparing the drug, which I have myself seen in the West Indies, is exceedingly simple. When the plant has arrived at proper maturity, the laborers go into the field with tubs and knives, and cut the largest and most succulent leaves close to the stalk; these are placed upright in the tubs, side by side, so that the sap may flow out of the wound. Sometimes a longitudinal incision is made from top to bottom of the leaf, to facilitate the discharge. The crude juice thus obtained is placed in shallow flat-bottomed receivers, and exposed to the sun until it has acquired sufficient consistency to be packed in gourds for exportation. In preparing the coarser kind, or horse aloes, the leaves are cut into junks and thrown into the tubs, there to lie till the juice is pretty well drained out; they are then squeezed by the hand, and water, in the proportion of one quart to ten of juice, is added, after which it is boiled to a due consistence and emptied into large shallow coolers.
The following analysis by M. Edmond Robiquet of a specimen of Socotrine aloes, obtained from M. Chevallier, is given in the sixth volume of the "Pharmaceutical Journal," p. 277. The constituents in 100 parts were:—
| Pure aloes (Aloetine) | 85.00 |
| Ulmate of potash | 2.00 |
| Sulphate of lime | 2.00 |
| Carbonate of potash | traces. |
| Carbonate of lime | |
| Phosphate of lime | |
| Gallic acid | .25 |
| Albumen | 8.00 |
The true Socotrine aloes is the produce of A. Socotrina, which grows abundantly in the island of Socotra in the Indian Ocean. Lieutenant Wellstead says, the hills on the west side of the island are covered for an extent of miles with aloe plants. The aloe grows spontaneously on the limestone mountains of Socotra, from 500 to 3,000 feet above the level of the sea. The produce is brought to Tamarida and Colliseah, the principal town and harbor for exports. In 1833, the best quality sold for 2s. a pound, while for the more indifferent the price was 13d. The value is much impaired by the careless manner in which the aloes is gathered and packed. Aloes once formed the staple of its traffic, for which it was chiefly resorted to; but only small quantities are now exported. It was formerly shipped by the way of Smyrna and Alexandria, but is usually now brought by the way of Bombay; Melinda, on the Zanzibar coast, and Maccula on the Arabian shore, furnish the greater part of that sold in Europe as Socotrine aloes. It comes home in chests or packages of 150 to 200 lbs. wrapt in skins of the gazelle, sometimes in casks holding half a ton or more. It is somewhat transparent, of a garnet or yellowish red color. The smell is not very unpleasant, approaching to myrrh. Socotrine aloes, although long considered the best kind, is now below Barbados aloes in commercial value.
About two tons were imported from Socotra in 1833, but a much larger quantity could be obtained if required.
The price of Socotrine aloes in the Liverpool market, in the early part of 1853, was 30s. to £6 the cwt.; of Cape, 30s. to 32s.
East Indian, or Hepatic aloes.— The real hepatic aloes, so called from its liver color, is believed to be the produce of A. Arabica, or perfoliala, which grows in Yemen in Arabia, from whence it is exported by the way of Bombay to Europe. According to Dr. Thomson and the "Materia Medica," it is duller in its color than the other kinds, is bitterer, and has a less pleasant aroma than the Socotrine aloes. It should not be liquid, which deteriorates the quality.
A. Indica—a species with reddish flowers, common in dry situations, in the north-west provinces of India, is that from which an inferior sort of the drug is produced. It is obtained in Guzerat, Salem, and Trichinopoly, and fetches a local price of 2d. to 3d. a pound. In the Bombay market, Socotrine aloes fetches wholesale 16s. to 20s. the Surat maund of 41 lbs., and Maccula aloes only 9s.