Barbados aloes, is the produce of A. vulgaris, or A. barbadensis, a native of the Cape colony, and is often passed off for the Hepatic. It is brought home in calabashes, or large gourd shells, containing from 60 to 70 lbs. each, or more. It is duskier in hue than the East Indian species, being a darkish brown or black, and the taste is more nauseous and intensely bitter.
In 1786 one hogshead and 409 gourds of aloes were exported from Barbados. In 1827, there were about 96,000 packages shipped from the island. In 1844, there were 4,600 packages exported. The exports have fallen off considerably, only about 850 gourds having been shipped in the season of 1849-50; but in 1851 it increased to 2,505 gourds.
Caballine, or Horse-aloes, is the coarsest species or refuse of the Barbados aloes, and from its rank fetid smell is only useful for veterinary medicine. It is also obtained from Spain and Senegal.
A very good description of the mode of cultivating and preparing the aloes in Barbados is given in the 8th vol. of the "London Medical Journal":—
The lands in the vicinity of the sea, that is from two to three miles, which are rather subject to drought than otherwise, and are so strong and shallow as not to admit of the planting of sugar-canes with any prospect of success, are generally found to answer best for the aloe-plant. The stones, at least the larger ones, are first picked up, and either packed in heaps upon the most shallow barren spots, or laid round the field as a dry wall. The land is then lightly ploughed and very carefully cleared of all noxious weeds, lined at one foot distance from row to row, and the young plants set like cabbages, at about five or six inches from each other. This regular mode of lining and setting the plants is practised only by the most exact planters, in order to facilitate the frequent weeding by hand; because if the ground be not kept perfectly clean and free from weeds, the produce will be very small. Aloes will bear being planted in any season of the year, even in the dryest, as they will live on the surface of the earth for many weeks without a drop of rain. The most general time of planting them, however, is from April to June.
In the March following, the laborers carry a parcel of tubs and jars into the field, and each takes a slip or breadth of it, and begins by laying hold of a bunch of the blades, as much as he can conveniently grasp with one hand, whilst with the other he cuts it just above the surface of the earth as quickly as possible (that the juice may not be wasted), and then places the branches in the tub bunch by bunch or handful by handful. When the first tub is thus packed quite full, a second is begun (each laborer having two); and by the time the second is filled, all the juice is generally drained out of the blades in the first tub. The blades are then lightly taken out and thrown over the land by way of manure, and the juice is poured out into a jar. The tub is then filled again with blades, and so alternately, till the laborer has produced his jar full, or about four gallons and a half of juice, which is often done in six or seven hours, and he has then the remainder of the day to himself, it being his employer's interest to get each day's operation as quickly done as possible. It may be observed that although aloes are often cut in nine, ten, or twelve months after being planted, they are not in perfection till the second or third year, and that they will be productive for a length of time, say ten or twelve years, or even for a longer time, if good dung or manure of any kind is stirred over the field once in three or four years, or oftener if convenient.
The aloe juice will keep for several weeks without injury. It is therefore not boiled till a sufficient quantity is procured to make it an object for the boiling house. In the large way, three boilers, or coppers are placed to one fire, though some have but two, and the small planters only one boiler. The boilers are filled with the juice, and as it ripens or becomes more inspissated by a constant but regular fire, it is ladled from boiler to boiler, and fresh juice is added to that farthest from the fire, till the juice in that nearest the fire (by much the smallest of the three) becomes of a proper consistency, to be skipped or ladled out into gourds or other small vessels used for its final reception. The proper time to skip or ladle it out of the last boiler is when it has arrived at what is termed a resin height, or when it cuts freely or in thin flakes from the edges of a small wooden slice that is dipped from time to time into the boiler for that purpose. A little lime water is used by some aloe boilers during the process, when the ebullition is too great.
CAPE ALOES is the produce chiefly of A. spicata, and A. Commelini, which are found growing wild in great abundance in the interior of the Cape Colony. It has not the dark opaque appearance of the other species. About fifty miles from Cape Town is a mountainous tract, almost entirely covered with numerous species and varieties of the plant, and some of the extensive arid plains in the interior of the colony are crowded with it. The settlers go forth and pitch their waggous and campa on these spots to obtain the produce. The shipments from Table Bay and the eastern port of Algoa Bay are very considerable. The odor of the Cape aloes is stronger and more disagreeable than that of the Socotrine or Barbados, and the color is more like gamboge. It is brought over in chests and skins, the latter being preferred.
Mr. George Dunsterville, surgeon of Algoa Bay, gives the following description of the manufacture of Cape aloes:—
A shallow pit is dug, in which is spread a bullock's hide or sheep's skin. The leaves of the aloe plants in the immediate vicinity of this pit are stripped off and piled up on the skin to variable heights. These are left for a few days. The juice exudes from the leaves, and is received by the skin beneath. The Hottentot then collects in a basket or other convenient article the produce of many heaps, which is then put into an iron pot capable of holding eighteen or twenty gallons. Fire is applied to effect evaporation, during which the contents of the pot are constantly stirred to prevent burning. The cooled liquor is then poured into wooden cases of about three feet square by one foot deep, or into goat or sheep skins, and thus is filled for the market. In the colony aloes realises about 2¼ d. to 3½ d. per pound. The Hottentots and Dutch boors employ indiscriminately different species of aloe in the preparation of the drug.