Insoluble in water, 72.45 per cent:-- Soluble silica 17.34 Insoluble silicious matter 10.04 Oxide of iron and alumina with phosphates 8.47 (Containing phosphoric acid, 3.18 per cent.) (Equal to bone-earth, 6.88 per cent.) Lime 20.21 Magnesia 2.56 Potash 1.78 Soda 0.38 Sulphuric acid 1.27 Carbonic acid and loss 10.40 ------ 100.00 ------- Composition of rotten dung, six months old, is as follows:-- Water 75.42 * Soluble organic matter 3.71 Soluble inorganic matter 1.47 + Insoluble organic matter 12.82 Insoluble inorganic matter 6.58 ------ 100.00 ------ * Containing nitrogen .297 Equal to ammonia .360 + Containing nitrogen .309 Equal to ammonia .375 Total amount of nitrogen .606 Equal to ammonia .735 Ammonia in a volatile state .046 Ammonia in form of salts .057 Composition of the whole ash:-- Soluble in water, 18.27 per cent:-- Soluble silica 3.16 Phosphate of lime 4.75 Lime 1.44 Magnesia 0.59 Potash 5.58 Soda 0.29 Chloride of sodium 0.46 Sulphuric acid 0.72 Carbonic acid and loss 1.28