This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1899 edition. Excerpt: ...sulphate of ammonia is said to contain 24 units of ammonia or i9f units of nitrogen. The price per unit of ammonia is therefore ?10 2s. 6d.-r-24 = 8s., 5d.; while a unit of nitrogen costs ?10 2s. 6d.-h 19I = 10s. 3d. Similarly, the nitrate of soda is said to contain 15-65 units of nitrogen, or 19 units of ammonia; the price of the former being nearly 9s. 1 id. per unit, that of the latter 8s. 2d. per unit. In actual working, this system of estimating the cost per unit is very simple and helpful in comparing the relative costs of manures; for by it, and taking into account also the suitability of two manures for any given purpose, we can decide on their comparative economy. It will be easily realized that nitrogen is sometimes cheaper in one manure, sometimes in another,...

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