The text provides a comprehensive manual on the commercial products derived from the vegetable kingdom, focusing heavily on the husbandry of tropical and sub-tropical regions. It opens with an extensive exploration of dietetic beverages and crops, beginning with the cultivation of cacao, its varieties, and the detailed processes required to yield the fatty oil and aromatic beans. The narrative details the geography of cacao production across South America and the West Indies, noting the climatic needs, natural enemies such as destructive worms and parasitical plants, and the precise harvesting methods necessary to prevent decay.
The author then transitions to a thorough examination of coffee, tracing its historical consumption, fiscal changes, and the shift in global supply from the West Indies to the East. Practical instruction is given on soil requirements, elevation, nurseries, transplanting, and the mechanics of pulping, fermenting, and drying the berry. Attention is drawn to the chemical composition of the plant, the necessity of specific lime-based soil nutrients, and the employment of machinery to improve the quality of the harvested bean for European markets.
The work continues with an exhaustive analysis of tea, its consumption across the globe, and the vast scale of production in China and emerging regions like Assam. It addresses the economic factors influencing the tea trade, the varieties of black and green leaves, and the methods of preparation. The text further investigates sugar, detailing the cultivation of the sugar cane, beet-root, and maple, alongside chemical distinctions between cane and grape sugars, and improvements in manufacturing machinery.
Subsequent sections evaluate starch-producing plants, root crops, spices such as cinnamon, cloves, nutmegs, and pepper, as well as dye-woods, tanning barks, and oleaginous seeds. The economic importance of each plant is supported by trade statistics, shipping data, and precise descriptions of soil management. The volume concludes by establishing a clear relationship between the botanical characteristics of economic plants and their practical utility for commerce.
