Insoluble in water, 81.73 per cent:-- Soluble silica 17.69 Insoluble silica 12.54 Phosphate of lime - Oxides of iron alumina with phosphates 11.76 (Containing phosphoric acid, 3.40 per cent.) (Equal to bone-earth, 7.36 per cent.) Lime 20.70 Magnesia 1.17 Potash 0.56 Soda 0.47 Chloride of sodium - Sulphuric acid 0.79 Carbonic acid and loss 16.05 ------ 100.00 ------ NOTE XIII. (p. 263). COMPARISON OF FRESH AND ROTTEN MANURE (WOLFF). Fresh. Moderately rotten (Taking the quantity of dry matter as the same.) Dry matter 25.00 25.00 Ash 3.81 4.76 Nitrogen 0.39 0.49 Potash 0.45 0.56 Lime 0.49 0.61 Magnesia 0.12 0.15 Phosphoric acid 0.18 0.23 Sulphuric acid 0.10 0.13 Silica 0.86 1.08 NOTE XIV. (p. 263). LORD KINNAIRD'S EXPERIMENTS.[182] "Lord Kinnaird has given the particulars of a very careful experiment. He tried to test the comparative value of manure kept in an open court with that kept under cover. He selected the same kind of cattle, gave them the same kind and quantity of food, and bedded them with the same kind of straw. A field of 20 acres of uniform land was selected. This having been equally divided, 2 acres out of each 10 gave the following results:-- _Potatoes grown with Uncovered Manure._ Tons. cwt. lb. First measurement--1 acre produced. 7 6 8 Second do. do. do. 7 18 99 _Potatoes grown with Covered Manure._ First measurement--1 acre produced. 11 17 56 Second do. do. do. 11 12 26 This shows an increase of about 4 tons of potatoes per acre with the covered manure. "The next year the weather was wet, grain soft and not in very good order, but the following was the amount of produce:-- _Wheat grown with Uncovered Manure._