Your Committee would suggest every possible attention being drawn to this subject, in which they are gratified to state, the Commissioners of the Central Road Board have evinced a readiness to co-operate, by offering to place at the Society's disposal the sum of £10 10s., "to be given as a premium for the best information respecting the wax berry plant, the soils and situations in which it is found to grow most luxuriantly: the best mode of propagating and cultivating it, of collecting the berries, and extracting and preparing the wax, &c." And from a letter received from the Secretary to the Central Road Board, it appears that the Board had authorised the shipment to England of 2,561 lbs. of the wax, by the Queen of the South in November last, which, from the account sales lately received from Messrs. J.R. Thomson & Co., realised as follows, viz.:—
This statement shows that from a plant, which is indigenous to the colony, and might he cultivated to almost any extent, and mostly on soils unavailable for other purposes, an article of great export could be derived at a comparatively small expense; it is with that view that I desire to direct public attention more prominently to it.
In the Museum of the Royal Botanic Gardens, at Kew, wax is shown as scraped from the trunk of the wax palm (Ceroxylon andicola), and candles made from it, as also some made of acorns and closely resembling common tallow. Concrete milk and butter made from the Shea butter tree, and others growing in Para, are also exhibited.
Wax candles have been made from the seeds of Myrica macrocarpa in Colombia, and also from vegetable wax in Java. Some of these are to be seen in the Museum of the Pharmaceutical Society of London.
CASTOR OIL PLANT.
Castor oil is expressed from the seeds of Ricinus communis (Palma Christi), a plant with petale-palmate leaves, which is found native in Greece, Africa, the South of Spain, and the East Indies, and is cultivated in the West Indies, as well as in North and South America. In the temperate and northern parts of Europe, the plant is an herbaceous annual, of from three to eight feet high; in the more southern parts it becomes scrubby and even attains an height of twenty feet; while in India it is often a tree thirty to forty feet high. The best oil is obtained by expression from the seeds without heat, and is hence called "cold drawn oil." A large quantity of oil may be produced by boiling the seeds, but it is less sweet and more apt to become rancid than that procured by expression.
The Palma Christi grows continuously for about four years, and becomes a large tree in constant bearing, ripening its rich clusters of beans in such profusion, that 100 bushels may be obtained annually from an acre, and their product of oil two gallons per bushel.
There are several species, all of which yield oil of an equally good quality. A shrubby variety is common in South Australia, and other parts of New Holland. Ricinus lividus is a native of the Cape of Good Hope. It is a hardy plant, of the easiest culture, and will thrive in almost any soil, whether in the burning plains or the coldest part of the mountains. The seed should be planted in the tropics in September, singly, and at the distance of 10 or twelve feet apart. They will bear the first season, and continue to yield for years. When the seed-pods become brown, they are in a fit state to pluck. It is often grown in the East intermixed with other crops. The primitive mode of obtaining the oil is to separate the seeds from the husks, and bruise them by tying them up in a grass mat. In this state they are put into a boiler amongst water, and boiled until all the oil is separated, which floats at the top, and the refuse sinks to the bottom; it is then skimmed off, and put away for use. The purest oil is obtained, as before-mentioned, by crushing the seeds (which are sewed up in horsehair bags), by the action of heavy iron beaters. The oil, as it oozes out, is caught in troughs, and conveyed to receivers, whence it is bottled for use.
Castor oil is used for lamps in the East Indies, and the Chinese have some mode of depriving it of its medicinal properties, so as to render it suitable for culinary purposes.