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Aloes | | Name : | Aloes | | Botanical : | Aloe Perryi , Aloe vera | | Family : | Liliaceae | | Parts Used : | Leaves. | | Habitat : | Aloes are indigenous to East and South Africa, but have been introduced into the West Indies (where they are extensively cultivated) and into tropical countries, and will even flourish in the countries bordering on the Mediterranean. | | Description : | They are succulent plants belonging to the Lily family, with perennial, strong and fibrous roots and numerous, persistent, fleshy leaves, proceeding from the upper part of the root, narrow, tapering, thick and fleshy, usually beset at the edges with spiney teeth. Many of the species are woody and branching. In the remote districts of S.W. Africa and in Natal, Aloes have been discovered 30 to 60 feet in height, with stems as much as 1O feet in circumference.
The flowers are produced in erect, terminal spikes. There is no calyx, the corolla is tubular, divided into six narrow segments at the mouth and of a red, yellow or purplish colour. The capsules contain numerous angular seeds.
The true Aloe is in flower during the greater part of the year and is not to be confounded with another plant, the Agave or American Aloe (Agave Americana), which is remarkable for the long interval between its periods of flowering. This is a succulent plant, without stem, the leaves being radical, spiney, and toothed. There is a variety with variegated foliage. The flower-stalk rises to many feet in height, bearing a number of large and handsome flowers. In cold climates there is usually a very long interval between the times of its flowering, though it is a popular error to suppose that it happens only once in a hundred years for when it obtains sufficient heat and receives a culture similar to that of the pineapple, it is found to flower much more frequently. Various species of Agave, all of which closely resemble each other, have been largely grown as ornamental plants since the first half of the sixteenth century in the south of Europe, and are completely acclimatized in Spain, Portugal and Southern Italy, but though often popularly called Aloes all of them are plants of the New World whereas the true Aloes are natives of the Old World. From a chemical point of view there is also no analogy at all between Aloes and Agaves.
Although the Agave is not employed medicinally, the leaves have been used in Jamaica as a substitute for soap, the expressed juice (a gallon of the juice yields about 1 lb. of the soft extract), dried in the sun, being made into balls with wood ash. This soap lathers with salt water as well as fresh. The leaves have also been used for scouring pewter and kitchen utensils. The inner spongy substance of the leaves in a decayed state has been employed as tinder and the fibres may be spun into a strong, useful thread.
The fleshy leaves of the true Aloe contain near the epidermis or outer skin, a row of fibrovascular bundles, the cells of which are much enlarged and filled with a yellow juice which exudes when the leaf is cut. When it is desired to collect the juice, the leaves are cut off close to the stem and so placed that the juice is drained off into tubs. This juice thus collected is concentrated either by spontaneous evaporation, or more generally by boiling until it becomes of the consistency of thick honey. On cooling, it is then poured into gourds, boxes, or other convenient receptacles, and solidifies.
Aloes require two or three years' standing before they yield their juice. In the West Indian Aloe plantations they are set out in rows like cabbages and cutting takes place in March or April, but in Africa the drug is collected from the wild plants. | | Constituents : | The most important constituents of Aloes are the two Aloins, Barbaloin and Isobarbaloin, which constitute the so-called 'crystalline' Aloin, present in the drug at from 1O to 30 per cent. Other constituents are amorphous Aloin, resin and Aloe-emodin. The proportion in which the Aloins are present in the respective Aloes is not accurately known.
The manner in which the evaporation is conducted has a marked effect on the appearance of the Aloes, slow and moderate concentration tending to induce crystallization of the Aloin, thus causing the drug to appear opaque. Such Aloes is termed 'livery' or hepatic, and splinters of it exhibit minute crystals of Aloin when examined under the microscope. If, on the other hand, the evaporation is carried as far as possible, the Aloin does not crystallize and small fragments of the drug appear transparent; it is then termed 'glassy,' 'vitreous,' or 'lucid' Aloes and exhibits no crystals of Aloin under the microscope. | | Uses : | The drug Aloes is one of the safest and best warm and stimulating purgatives to persons of sedentary habits and phlegmatic constitutions. An ordinary small dose takes from 15 to 18 hours to produce an effect. Its action is exerted mainly on the large intestine, for which reason, also it is useful as a vermifuge. Its use, however, is said to induce Piles.From the Chemist and Druggist (July 22, 1922): 'Aloes, strychnine and belladonna in pill form was criticized by Dr. Bernard Fautus in a paper read before the Chicago branch of the American Pharmaceutical Society. He pointed out that when given at the same time they cannot possibly act together because of the different speed and duration of the three agents. Aloin is slow in action, requiring from 10 to 12 hours. Strychnine and Atropine, on the other hand, are rapidly absorbed, and have but a brief duration of action.'
Preparations of Aloes are rarely prescribed alone, they require the addition of carminatives to moderate the tendency to griping. The compound preparations of Aloes in use generally contain such correctives, but powdered Aloes and the extracts of Aloes represent the crude drug.
Aloes in one form or another is the commonest domestic medicine and is the basis of most proprietary or so-called 'patent' pills.
There is little to choose medicinally between the Curacoa and Socotrine varieties, but the former is somewhat more powerful, 2 grains of Curacoa Aloes being equal to 3 grains of Socotrine Aloes in purgative action. The latter is more expensive, but varies much in quality.
Aloes is the purgative in general uses for horses, it is also used in veterinary practice as a bitter tonic in small doses, and externally as a stimulant and desiccant.
Aloes was employed by the ancients and was known to the Greeks as a production of the island of Socotra as early as the fourth century B.C. The drug was used by Dioscorides, Celsus and Pliny, as well as by the later Greek and Arabian physicians, though it is not mentioned either by Hippocrates or Theophrastus.
From notices of it in the Anglo-Saxon leech-books and a reference to it as one of the drugs recommended to Alfred the Great by the Patriarch of Jerusalem, we may infer that its use was not unknown in Britain as early as the tenth century. At this period the drug was imported into Europe by way of the Red Sea and Alexandria. In the early part of the seventeenth century, there was a direct trade in Aloes between England and Socotra, and in the records of the East Indian Company there are notices of the drug being bought of the King of Socotra, the produce being a monopoly of the Sultan of the island.
The word Aloes, in Latin Lignum Aloes, is used in the Bible and in many ancient writings to designate a substance totally distinct from the modern Aloes, namely the resinous wood of Aquilaria agallocha, a large tree growing in the Malayan Peninsula. Its wood constituted a drug which was, down to the beginning of the present century, generally valued for use as incense, but now is esteemed only in the East.
A beautiful violet colour is afforded by the leaves of the Socotrine Aloe, and it does not require a mordant to fix it. |
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