Oat-straw | 83.0 | 5.50 | 0.48 | 0.93 | 0.60 | 2.90 26. Mangel-wurzel | 12.5 | 1.00 | 0.09 | 0.25 | 0.25 | 1.07 27. Swedish turnips | 11.0 | 0.68 | 0.13 | 0.18 | 0.22 | 0.91 28. Common turnips | 8.0 | 0.68 | 0.11 | 0.29 | 0.18 | 0.86 29. Potatoes | 24.0 | 1.00 | 0.32 | 0.43 | 0.35 | 1.50 30. Carrots | 13.5 | 0.70 | 0.13 | 0.23 | 0.20 | 0.80 31. Parsnips | 15.0 | 1.00 | 0.42 | 0.36 | 0.22 | 1.14 -----------------------+------+------+------+------+------+------- * The manure from a ton of undecorticated cotton-seed cake is worth $15.74; that from a ton of cotton-seed, after being ground and sifted, is worth $13.25. The grinding and sifting in Mr. Lawes’ experiments, removed about 8 per cent of husk and cotton. Cotton-seed, so treated, proved to be a very rich and economical food. † Middlings, Canielle. ‡ Shipstuff. Of all vegetable substances used for food, it will be seen that decorticated cotton-seed cake is the richest in nitrogen, phosphoric acid, and potash, and consequently makes the richest and most valuable manure. According to Mr. Lawes’ estimate, the manure from a ton of decorticated cotton-seed cake is worth $27.86 in gold. Rape-cake comes next. Twenty-five to thirty years ago, rape-cake, ground as fine as corn-meal, was used quite extensively on many of the light-land farms of England as a manure for turnips, and not unfrequently as a manure for wheat. Mr. Lawes used it for many years in his experiments on turnips and on wheat. Of late years, however, it has been fed to sheep and cattle. In other words, it has been used, not as formerly, for manure alone, but for food first, and manure afterwards. The oil and other carbonaceous matter which the cake contains is of little value for manure, while it is of great value as food. The animals take out this carbonaceous matter, and leave nearly all the nitrogen, phosphoric acid, and potash in the manure. Farmers who had found it profitable to use on wheat and turnips for manure alone, found it still more profitable to use it first for food, and then for manure afterwards. Mr. Lawes, it will be seen, estimates the manure produced from the consumption of a ton of rape-cake at $21.01.