ANALYSES OF BRACKEN (by J. HUGHES, F.C.S.) No. 1 No. 2 Young fern. Old fern. Per cent. Per cent. Water 11.66 14.90 * Organic matter 83.38 80.54 + Mineral matter 4.96 4.56 ------ ------ 100.00 100.00 ------ ------ Containing-- * Nitrogen 2.42 0.90 + Silica 1.60 2.81 Potash 1.15 0.10 Soda 0.64 0.26 Lime 0.44 0.62 Magnesia 0.13 0.47 Phosphoric acid 0.60 0.30 NOTE IX. (p. 244). ANALYSES OF HORSE-MANURE. For a fuller discussion of this question, the reader is referred to Heiden's 'Duengerlehre,' vol. ii. p. 185, and also to Storer's 'Agricultural Chemistry,' vol. i. p. 575. The statements in the different text-books as to the quantity of manure produced by the horse are such as naturally to perplex the student. This discrepancy is due, however, to the different methods adopted by different writers of calculating this amount. The subject is further discussed in the footnote to p. 252. The following analyses of horse-manure may be valuable for reference. They are taken from Storer's 'Agricultural Chemistry,' vol. i. p. 496:-- ----------------+-------+-------+-------+-------+-------+--------- | 1. | 2. | 3. | 4. | 5. | Average. ----------------+-------+-------+-------+-------+-------+--------- Water | 75.76 | 69.30 | 67.23 | 72.13 | 71.30 | 71.15 Dry matter | 24.24 | 24.82 | 32.72 | 27.87 | 28.70 | 27.67 Ash ingredients | 5.07 | 5.05 | 6.49 | 3.37 | 3.30 | 4.65 Potash | 0.51 | 0.63 | 0.22 | 0.59 | 0.53 | 0.49 Lime | 0.30 | 0.74 | 0.17 | 0.41 | 0.21 | 0.36 Magnesia | 0.19 | 0.29 | 0.20 | 0.17 | 0.14 | 0.20 Phosphoric acid | 0.41 | 0.67 | 0.35 | 0.12 | 0.28 | 0.36 Ammonia | 0.26 | 0.12 | 0.15 | 0.44 | - | 0.24 Total nitrogen | 0.53 | 0.69 | 0.47 | 0.67 | 0.58 | 0.59 ----------------+-------+-------+-------+-------+-------+--------- NOTE X. (p. 247). THE NATURE OF THE CHEMICAL REACTIONS OF AMMONIA "FIXERS." For the student, the exact nature of the chemical reactions taking place may be of interest.