The Exploitation of Plants

ISBN: 9781330498828 出版年：2016 页码：183 F W Oliver Forgotten Books

If is not possible to say offhand what proportion commodities of vegetable origin bear to the total of all merchantable goods. The volume of trade in plant products may be guessed to be not less than one-half, and, if coal be included, may well exceed 60 per cent. Of the whole. Moreover, animal products derived from the herds which we tend depend largely on a proper utilisation of the plants which form their food, so that the exploitation of animals is closely related to our present subject matter.