The following account I derive from my friend Dr. Hamilton--

"It is a small tree, of about twenty feet in height, of most rapid growth, coming into flower within a few months after it has been sown, and continuing to produce seeds and blossoms afterwards throughout the year. The tree is now naturalised in the West Indies.

The timber is said to dye a fine blue, and the gum, which, exudes from wounds in the bark, bears a strong resemblance to that obtained from the _Astragalus tragacantha_, for which it might, no doubt, be subst.i.tuted.

The numerous racemes of white blossoms with which the tree is constantly loaded, are succeeded by long triangular pods, somewhat tourlose at the ends, and about two feet in length, when arrived at the full growth. These pods, while yet young and tender, are not unfrequently cooked and served up at the planter's tables like asparagus, for which they are not a bad subst.i.tute. The pods, when full grown, contain about fifteen seeds; each considerably larger than a pea, with a membraneous covering expanding into three wings, whence the specific name of _pterygosperma_. On removing the winged envelope the seeds appear somewhat like pith b.a.l.l.s; but upon dividing them with the nail, they are found to abound in a clear, colorless, tasteless, scentless oil, of which the proportion is so large that it may be expressed from good fresh seeds by the simple pressure of the nail. Geoffry informs us, that he obtained 30 ounces of oil from eight pounds of the decorticated seeds, being at the rate of very nearly 24 lbs. of oil from 100 lbs. of seed.

Notwithstanding the great value of its oil, and the facility with which it can be obtained in the West Indies, the moringa has been hitherto valued merely as an ornamental shrub, and cultivated for the sake of its young pods or the horseradish of its roots, as luxuries for the table.

The oil is peculiarly valuable for the formation of ointments, from its capability of being kept for almost any length of time without entering into combination with oxygen. This property, together with the total absence of color, smell, and taste, peculiarly adapts it to the purposes of the perfumer, who is able to make it the medium for arresting the flight of those highly volatile particles of essential oil, which const.i.tute the aroma of many of the most odoriferous flowers, and cannot be obtained by any other means, in a concentrated and permanent form. To effect this, the petals of the flowers, whose odor it is desired to obtain, are thinly spread over flakes of cotton wool saturated with this oil, and the whole enclosed in air tight tin cases, where they are suffered to remain till they begin to wither, when they are replaced by fresh ones, and the process thus continued till the oil has absorbed as much as was desired of the aroma; it is then separated from the wool by pressure, and preserved under the name of _essence_, in well stopped bottles.

By digesting the oil thus impregnated in alcohol, which does not take up the fixed oil, a solution of the aroma is effected in the spirit, and many odoriferous tinctures or waters, as they are somewhat inaccurately termed, prepared. By this process most delicious perfumes might be obtained from the flowers of the _Acacia tortuosa_, _Pancratium carribeum_, _Plumeria alba_, _Plumeria rubra_, and innumerable other flowers, of the most exquisite fragrance, which abound within the tropics, blooming unregarded, and wasting their odors on the barren air."

THE OIL PALM.

There are several species of this genus of beautiful palms of the tribe _Cococinae_, but that chiefly turned to account is _Elais guineensis_, a native of the Coast of Guinea to the south of Fernando Po, which furnishes the best oil.

There are three other varieties--_E. melanococca_, a native of New Granada, _E. Pernambucana_, common on the coast of Brazil, and _J.

occidentalis_, indigenous to Jamaica. All the species grow well in a sandy loam and may be increased by suckers.

The value of the oil of this palm, as an article of commerce, is exemplified by the large annual imports, averaging more than 516,000 cwt. for many years past.

Our supplies of palm oil are almost wholly derived from the West Coast of Africa, of which it is the staple article of export.

Palm oil has the greatest specific gravity of any of the fixed vegetable oils. It is used princ.i.p.ally in this country for making yellow soap. But the inhabitants of the Guinea coast employ it for the same purposes that we do b.u.t.ter.

The trade in palm oil has almost driven out the slave trade from the Bight of Benin, which was a few years ago one of its princ.i.p.al seats.

The old slave traders at Whydah have generally gone into the palm oil trade, and are carrying it on to a very great extent. In August 1849, no less than twelve vessels were lying at that port taking in oil; whilst, only three years before, it was rare to see three vessels there at once, and of those in all probability two would be slavers.

This palm is called Maba by the natives about the Congo river. It is moneocious, which indeed Jacquin, by whom the genus was established, concluded it to be, although first described as dioecious by Gaertner, whose account has been adopted, probably without examination, by Schroder, Willdenow, and Persoon.

The average imports of this oil into Liverpool alone, have now been for some years upwards of 18,000 tons, worth nearly 800,000 sterling, and giving employment to upwards of 30,000 tons of shipping; thus proving that the natives who formerly exported their brethren as a matter of traffic, now find, at least, an equally profitable trade in the exportation of the vegetable products of their native soil.

Palm oil is produced by the nut of the tree, which grows in the greatest abundance throughout Western Africa. The demand for it, both in Europe and America, is daily increasing, and there is no doubt it will, ere long, become the most important article of African trade.

IMPORTS INTO LIVERPOOL.

casks. tons.

1835 28,500 9,500 1836 33,500 11,000 1837 26,000 9,900 1838 27,520 10,320 1839 36,500 14,300 1852 about -- 23,500

In the colony of Liberia, I notice the manufacture of a new article of African production, which is called "Herring's Palm Kernel Oil or African Lard." It is thus spoken of in the newspapers of that Republic :--

We had been for a long time impressed with an idea that the oil contained in the kernel of the palm nut, was superior both in quality and appearance to that of palm oil, which is obtained from the exterior part.

On making an effort to extract the oil from the kernel (which was by means of a little machine, of our own invention and contrivance), we found that our thoughts upon the matter were correct, that the oil possessed admirable beauty in its appearance, with a taste, when used for cooking purposes, unexcelled by that of the best lard.

After being made and set by, it a.s.sumes a consistence like that of hard b.u.t.ter, and has to be cut out with a knife or spoon; its appearance in this state is very beautiful, presenting such richness, clearness, and adaptedness to table purposes, that one would not suppose that this oil is obtained from the same tree from which palm oil is, for there is as much disparity both in their appearance and taste as there is between lard and b.u.t.ter.

The exquisite transparency which the kernel oil bears in a liquid state, especially when undergoing the purifying process, is a cause of admiration. On showing some of it to several foreigners, I was asked in two instances which was the oil and which the water, or whether it was oil or water; thus you may have an idea of its clearness. We make two qualities of this oil, differing however in taste only, the one being for table uses and the other for exportation and for whatever use they may choose to put it to abroad.

There have been many conjectures in respect to the uses to which this oil might he put in foreign countries; but that it will be a useful article, and especially in our trade, when made more extensively, there can be no doubt, for the quant.i.ty in which it might be had would undoubtedly introduce it to a respectable rank among the other commodities of our productive country so eagerly sought after.

There is nothing, to my knowledge, that can be turned to as good account and at the same time so abundant and easily obtained, as the palm kernel, for they are as common as the pebbles of stony land, especially in this section of the country, where we have palm orchards of spontaneous growth for miles together, and interspersing the surrounding country in almost innumerable numbers.

According to statistical ascertainment, there is on an average exported from this port, thirty thousand gallons of palm oil annually, from which fact we ascertain demonstratively that the palm kernels which are thrown away here (leaving out the whole leeward coast of our possessions) are sufficient to make thirty thousand gallons of oil, more or less. This is not at all a problematical speculation of ours, but we feel authorised to advance this a.s.sertion from the fact that one bushel of kernels, completely worked up, will make two gallons of oil. But to work them up is the thing, plentiful as they are; we however, hesitate not to say, that it can be done and probably will be.

Having now so far conquered the difficulties attending the manufacture of this oil, as that we can safely vouch a reasonable supply for home consumption, we most cheerfully recommend it to the citizens of this Republic, whose demands for it, for eating purposes, we doubt not can be supplied, and on very reasonable terms.

We will a.s.sure our customers that there will not be an ounce of dirt or sediment in a hundred pounds of our oil.

The recent abolition of the soap duty, by stimulating the demand for palm oil, will have an instant effect on the trade and commerce of Western Africa, by confirming the suppression of the slave trade, and giving an additional impetus to negro improvement. It will also increase the production for England of ground nuts, whence the oil so largely used in making continental soaps is expressed. "When (observes a recent writer) the Portuguese first treated with that coast, they found palm oil and ground nuts articles of native food, and so they remained down to a period within living memory. So used, they neither required any cultivation nor gave rise to any notions of property.

Though whole tracts of country are crowded by the oil-palm tree, little care was taken of what was, in fact, superabundant; and as for ground nuts, they were simply dug up as prudence or necessity dictated. Some thirty years ago a cask or two of palm oil was sent home from the Gold Coast; it met so ready a sale that it was further inquired after, and the total amount now imported into England ranges from 25,000 to 30,000 tons annually. The exportation of ground nuts is even larger; but, owing to our excise on soap, they had heretofore gone princ.i.p.ally to France---to Ma.r.s.eilles especially.

"Of these two articles, it is to be observed, the Western Coast of Africa appears to have a monopoly; and with respect to palm oil, it is further to be remarked, that it is exactly behind those ports and up those rivers, which were formerly the great nests of the slave trade, that its production is largest; and just as the slave trade there has been crushed, a commerce in palm oil has sprung up and replaced it.

There are men alive who recollect the slave trade flourishing on the Gold Coast; it has long been extinct there, and palm oil is now largely exported. It is but a very few years ago since that traffic appeared to be irrepressible at the mouths of the Niger: it is now expelled, and thence Liverpool obtains, instead, its supplies of palm oil. So also, later still, at Whydah, and the other ports of the kingdom of Dahomy, and along the Lagoon, which connects Dahomy with the Benin River, there the Spanish slave dealers are themselves inaugurating a commerce in palm oil. Already the trade in that quarter is considerable, and it would have extended much more rapidly than it has done, were it not that disorder and warfare in the interior have been promoted and prolonged by the indiscreet zeal of some of our own naval officers and by the desire of some of our missionaries to rule at Abeeokutu, at Lagos, and at Badagray. When, however, order and tranquillity are restored, a most important trade will undoubtedly arise there. A generation ago, when palm oil was merely an article of food, there was, we have said, no property in palm trees. Since, however, a large foreign demand has arisen for this oil, the plantations, as already they are called, begin to be cared for; and lately the t.i.tle to some of them has been disputed in our courts on the Gold Coast: a contention which const.i.tutes the first evidence we have received of the value of land, not actually under their own cultivation, being recognised by the natives. Thus the feeling of property and the desire for acc.u.mulation are springing up out of the palm oil trade; and they are everywhere the germs of nascent civilisation. It is no light question, therefore, thus involved in an increased demand for this article; it may produce African consequences of incalculable importance to the whole human race. It is in France hitherto that the great consumption of ground nut oil has occurred. It is there used in the manufacture of soaps, which, though preferred abroad, are little used in England--very much because of the Excise laws. The specific gravity of the soap made out of ground nut oil is higher than those laws permitted; in consequence we could neither make it for our own use nor for foreign exportation; and thus France has substantially the soap trade of the world. By the repeal of the duty, England will be enabled to compete--in this, as in all other trades--with France abroad."

The price, in Liverpool, for palm oil, in October, 1853, was 38 10s.

to 39 per ton.

We export annually nearly four million gallons of oil made from linseed, hemp seed, and rape seed.

PALM OIL RETAINED FOR HOME CONSUMPTION cwts.

1835 242,733 1836 234,357 1837 211,919 1838 272,991 1839 262,910 1840 314,881 1841 300,770 1842 353,672 1843 377,765 1844 363,335 1848 510,218 1849 493,331 1850 448,589 1851 493,598 1852 408,577

The quant.i.ty of the four princ.i.p.al vegetable oils annually imported into Great Britain, is shown by the following figures:--

Palm oil. Coco-nut oil. Castor oil. Olive oil.

cwts. cwts. cwts. tuns.

1848 510,218 85,463 4,588 10,086 1849 493,331 64,452 9,681 16,964 1850 448,589 98,040 -- 20,738 1851 608,550 55,995 -- 11,503 1852 623,231 101,863 -- 8,898

THE OLIVE-TREE (_Olea Europea_).--There are several varieties of this plant, two of which have been long distinguished--the wild and the cultivated. The former is an evergreen shrub or low tree, with spiny branches and round twigs; the latter is a taller tree, without spines, and with four-angled twigs. The fruit is a drupe about the size and color of a damson. Its fleshy pericarp yields by expression olive oil, of which the finest comes from Provence and Florence.

Spanish or Castile soap is made by mixing olive oil and soda, while soft soap is made by mixing the oil with potash.

The wild olive is indigenous to Syria, Greece, and Africa, on the lower slopes of Mount Atlas. The cultivated species grows spontaneously in Syria, and is easily reared in Spain, Italy and the South of France, various parts of Australia and the Ionian Islands.

Wherever it has been tried on the sea-coasts of Australia, the success has been most complete. There are several fine trees near Adelaide, some of them fourteen feet high, bearing fruit in abundance.

Unfortunately no one has attempted to cultivate the plant on a large scale, but in a few years Australia ought to suply herself with olive oil.

The olive tree is also grown in Hong-Kong.

There are five or six varieties of _O. Europoea_, or _sativa_, grown in the south of Europe, of which district they are for the most part natives.

The entire exports of olive oil from the kingdom of Naples have been estimated at 36,333 tuns a year, which, taken at its mean value when exported at 62 per tun, is equivalent to the annual sum of 2,252,646.

There are one or two distinct species, natives of the East Indies and the Cape of Good Hope. This genus of plants, besides their valuable products of oil and fruit, are also much admired for the fragrance of their white flowers. There is a yellow-blossomed variety, native of China, _O. fragrans_, the Lan-hoa of the Chinese, which is used to perfume their teas.

Olive oil now forms an article of export from Chili, being grown in most parts of that republic, particularly in the vicinity of St. Jago, where trees of three feet in diameter, and of a proportionate height, are common. The olive was first carried from Andalusia to Peru in 1560, by Antonio de Ribera, of Lima. Frezier speaks of the olive being used for oil in Chili, a century and a half ago.

The culture of the olive has been recommended for Florida and most of the Southern States of America. Formerly, on account of its slow growth, the olive was not considered very useful; but some years since a new variety was introduced into France, and into some parts of Spain and Portugal, which yields an abundant crop of fruit the second year after planting. They are small trees or rather shrubs, about four or five feet high. The fruit is larger than the common olive, is of a fine green color when ripe, and contains a great deal of oil, The advantages accruing from this new mode of cultivating the olive tree, are beyond all calculation. By the old method an olive tree does not attain its full growth, and consequently does not yield any considerable crop under thirty years; whereas the new system of cultivating dwarf trees, especially from cuttings, affords very abundant crops in two or three. An acre of land can easily grow 2,500 trees of the new variety, and the gathering of the fruit is easy, as it can be done by small children. At Beaufort, South Carolina, the olive is cultivated from plants which were obtained in the neighbourhood of Florence, Italy.

A gentleman in Mississippi is stated, by an American agricultural journal, to have olive trees growing, which at five years from the cutting bore fruit, and were as large at that age as they usually are in Europe at eight years old. The olive then, it is added, will yield a fair crop for oil at four years from the nursery, and in eight years a full crop, or as much as in Europe at from fifteen to twenty years of age.