Note 1 — AGRICULTURE. No. II.

Mr Brakenridge, of Bretton Lodge, who has extensive practice in land valuing, informs me that a mechanical analysis of the soil affords him much assistance; and he has found that in soils, whenever free from stagnant water, that in a mechanical analysis the larger the proportion which remains suspended in the water, the greater its powers of production will be found, and the less manure it will require. That the best soils are those which, when diffused and well stirred in water and allowed to stand for three minutes, from 20 to 30, say 25, per cent. is carried off with the water of decantation. When 30 per cent. and upwards is decanted off, the soil becomes retentive of water and consequently wet. When less than 20 per cent., say only 16 per cent. and under, is carried off, it becomes too porous; water passes through it too rapidly; its soluble matter is washed off into the substratum, and it has a strong tendency to become thin and sterile.

[2] The celebrated black earth of Russia contains 2,45 per cent. of nitrogen.