The homeward commerce which we carry on with our numerous Colonies, with our Indian Possessions, and with foreign countries, is principally in articles furnished by the vegetable kingdom, such as the cereal grains, wheat, rice, maize, &c.; vegetables used in preparing dietetic drinks and distilled liquors, as tea, coffee, cacao, and the sugar cane, grapes, &c.; spices and condiments; drugs; dyes and tanning substances, obtained from the bark, leaves, fruit, and roots of various herbs and trees; the expressed or distilled oils of different plants; fruits in the green, dried, or preserved state; starches obtained from the roots or trunks of many farinaceous plants; fibrous substances used for cordage, matting, and clothing, as cotton, Indian hemp, flax, coco-nut coir, plantain and pine-apple fibre; timber and fancy woods. These substances, in the aggregate, form at least nine-tenths in value of the whole imports of this country. There are also several products of the animal kingdom dependent on vegetable culture, which might be brought into this category, such as silk and cochineal. Very few of these products of the vegetable kingdom come to us in any other than an unmanufactured state; they are shipped to this country as the chief emporium and factory of the world, either for re-export or to be prepared for consumption by the millions to whom they furnish employment, sustenance, and articles of clothing.
It is a wise ordination of Providence, that the different nations of the earth are as it were mutually dependent on each other for many of the necessaries and luxuries of life, and the means of progress and civilization. Commerce is thus extended, the various arts and manufactures improved by comparison and competition; and the acres yet untilled in distant lands hold out strong inducements for immigration, their climate and products affording health, freedom, and independence to the over-tasked and heavily taxed artisan and agriculturist of Europe. Although the systems of tropical agriculture, generally pursued, are peculiar and effective, yet there is no doubt that much improvement remains to be carried out in the practices adopted, in the implements employed, and the machinery used for preparing the crops for shipment. In the British Isles our insulated position, limited extent of country, unsettled climate, and numerous population, aggregated in dense masses, have compelled us to investigate and avail ourselves of every improvement in agriculture, arts and manufactures, which experience, ingenuity, and a comparison with the customs of other countries, have placed at our disposal.
If we except sandy deserts, and some of the interior portions of the polar regions, it will be found that there is scarcely any country but what is capable of improvement. Indeed, so extensive are the resources of agriculture, that further improvements may be most easily effected.
Let us then examine and ascertain what new objects may be improved upon, and if by our speculations only one single article, either for food or use, is added to those already in use, or those that are already cultivated be improved upon, it is equivalent to an increase of our wealth.
An eminent writer has truly remarked that "Agriculture is the parent of Manufactures, seeing that the productions of nature are the materials of art."
In the economy of Providence every fragment of creation seems to unfold, as man progresses in the arts of life, unbounded capabilities of adaptation to his every want. We have, indeed, daily illustration of the truth of that trite and homely adage, that "nothing is made in vain."
That quaint old English poet, Herbert, who flourished in the fifteenth century, in a short poem on "Providence," has graphically described, in his unique vein, the sentiment which forces itself upon us in view of the numerous discoveries of the age in which we live:—
"All countries have enough to serve their need.
* * * * *
—The Indian nut alone
Is clothing, meat and trencher, drink and can,
Boat, cable, sail, and needle, all in one."
"The addition (it has been well observed) of even a single flower, or an ornamental shrub, to those which we already possess, is not to be regarded as a matter below the care of industry and science. The more we extend our researches into the productions of nature, the more are our minds elevated by contemplating the variety as well as the exceeding beauty and excellence of the works of the Creator."
The mode of arrangement of the various subjects treated of involved some consideration; two or three plans were open for adoption. 1st. To describe the several products in the order of their agricultural importance or commercial value. 2nd. An alphabetical reference, in the style of a Dictionary or Encyclopædia; and 3rd. Classifying them under subdivisions, according to their particular or chief uses. The last seemed to me the most desirable and efficient mode, although open to some objections, from the variety of uses to which different parts of many plants were applied. Some, as cotton, indigo, sugar, coffee, tea, &c., would readily fall into their proper division, but others, as the coco-nut, plantain, &c., from the variety of their products, would come under several heads. I have, however, endeavoured to meet this difficulty by placing each plant or tree under the section to which its most valuable production seemed naturally to refer it.