The Commercial Products of the Vegetable Kingdom / Considered in Their Various Uses to Man and in Their Relation to the Arts and Manufactures; Forming a Practical Treatise & Handbook of Reference for the Colonist, Manufacturer, Merchant, and Consumer, on the Cultivation, Preparation for Shipment, and Commercial Value, &c. of the Various Substances Obtained From Trees and Plants, Entering into the Husbandry of Tropical and Sub-tropical Regions, &c.

by P. L. Simmonds

It may be desirable at the outset to make a brief enumeration of the countries lying within the different zones, and the agricultural products of which come, therefore, more especially under the notice of the tropical planter.

Meyen, in his division of the horizontal range of vegetation into zones, extends—

1. The equatorial zone to fifteen degrees on both sides of the equator. In this division we shall find the Cape Verd Islands, Sierra Leone, Ascension, and St. Helena, the Republic of Liberia, the European and native settlements in the Gulf of Guinea, and on the western Coast of Africa, Abyssinnia, Zanzibar on the East Coast, Mocha and Aden in the Red Sea, the northern portion of Madagascar, the Seychelles, the Madras Presidency, Northern India, Ceylon and the Nicobar Islands, Sumatra, Siam, Malacca, Singapore and the Straits Settlements, Cochin China, the Phillippine Islands, Borneo, Celebes and the Moluccas, Java and Madura, Banca, the Johore Archipelago, Timor and the eastern group of Islands, with New Guinea, a large portion of Northern Australia, the Marquesas, Society's and other oceanic islands. In South America the Republics of Peru, Bolivia, Ecuador, New Granada, and Venezuela, British, French and Dutch Guiana, and a large portion of the empire of Brazil; Trinidad, Barbados, and most of the islands in the Carribean Sea.

This zone has a mean temperature of 78½ to 82½ Fahrenheit.

2. The tropical zone reaches from the 15th deg. on each side of the equator to the tropics in 23 lat. The mean temperature is 73½ to 78¾ deg. Summer temperature 80½ to 86 deg.; winter temperature in the eastern coast districts, 59 deg.

In this region is comprised the following countries:—Sandwich Isles, Canton, in province of China, Burmah, Calcutta, and a portion of the Bengal Presidency, the Bombay Presidency, Madagascar, Mauritius and Bourbon; the southern portion of Brazil, Cuba, St. Domingo, Mexico, and Central America.

3. The sub-tropical zone extends from the tropics 23 to 34 deg. of latitude. There are a number of tropical fruits in this region. The winters are mild and vegetation is green throughout the year. In the northern division of the zone palms and bananas grow on the plains. In this region is comprised all the extreme northern portions of Africa, coasting the Mediterranean, comprising Algiers and the Barbary States, Egypt, part of Persia, Cabool and the Punjab; the greater portion of China, Lower California, Texas, the South-Western States of America, the Bermudas, the Cape Colony and Natal, New South Wales, Southern and Western Australia—the Government settlements in the Northern Island of New Zealand, the largest portion of Chile, Paraguay, Uruguay and the Argentine Republics, the Provinces of Brazil from St. Paul to Rio Grande, Madeira and the Canary Isles.

To define accurately the conditions of temperature which a plant requires to maintain it in a flourishing condition we must ascertain within what limits its period of vegetation, may vary, and what quantity of heat it requires. This most remarkable circumstance was first observed by Boussingault, but unfortunately we do not as yet possess sufficiently accurate accounts of the conditions of culture in the various regions of the earth, to enable us to follow out this ingenious view in all its details. His theory is, that the time required by a plant to arrive at maturity is as the inverse ratio of the temperature; therefore, knowing the mean temperature of any place, and the number of days which a plant takes to ripen, the time required at any other point more or less elevated, can easily be ascertained. Peter Purry, a native of Switzerland, who settled in Charleston in the eighteenth century, in a memorial to the Duke of Newcastle, then Secretary of State, sets out with this postulate, that "there is a certain latitude on our globe, so happily tempered between the extremes of heat and cold, as to be more particularly adapted than any other for certain rich productions of the earth; among which are silk, cotton, indigo," &c.—and he fixes on the latitude of 33 deg., whether north or south, as the one of that peculiar character.

The following Table, showing the climate, duration and production of certain plants cultivated in tropical America, is from the proceedings of the Agricultural Society of Grenada. The second, column gives the altitude in English yards above the level of the sea. The third, the mean temperature by Fahrenheit's thermometer. The fourth, the average time required to commence bearing. The fifth, the number of plants in a Spanish "fanegada" of 170 varras, about 153 square yards. The sixth, the average duration of each plant. The seventh, the average produce of each plant in the year:—