The Magazine of Horticulture, Botany, and All Useful Discoveries and Improvements in Rural Affairs, Volumen7Hovey and Company, 1841 |
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Otras ediciones - Ver todas
The Magazine of Horticulture, Botany, and All Useful Discoveries ..., Volumen25 Vista completa - 1859 |
The Magazine of Horticulture, Botany, and All Useful Discoveries ..., Volumen24 Vista completa - 1858 |
The Magazine of Horticulture, Botany, and All Useful Discoveries ..., Volumen25 Vista completa - 1859 |
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Página 353 - In a few seconds, the free acids unite with the bases contained in the earth, and a neutral salt is formed in a very fine state of division.
Página 353 - The most easy and practical mode of effecting their division is to pour over the bones, in a state of fine powder, half of their weight of sulphuric acid diluted with three or four parts of water...
Página 349 - Ibs. of hay, or 200 cwt. of beet-root, which are the yearly produce of such a field; but it is less than the straw, roots, and grain of corn, which might grow on the same surface, would contain...
Página 355 - Michaux, and containing all the forest trees discovered in the Rocky Mountains, the territory of Oregon, down to the shores of the Pacific, and into the confines of California, as well as in various parts of the United States.
Página 351 - The fallow-time, as we have already shown, is that period of culture, during which land is exposed to a progressive disintegration by means of the influence of the atmosphere, for the purpose of rendering a certain quantity of alkalies capable of being appropriated by plants. Now, it is evident, that the careful tilling of fallow land must increase and accelerate this disintegration.
Página 353 - Ibs. of bone dust is sufficient to supply three crops of wheat, clover, potatoes, turnips, &c., with phosphates. But the form in which they are restored to a soil does not appear to be a matter of indifference. For the more finely the bones are reduced to powder, and the more intimately they are...
Página 349 - ... island of St. Michael (Azores). The gas issued from a fissure in the base of a hill of trachyte and tuffa from which a level field of some acres extended. This field, at the time of my visit, was in part covered with Indian corn. The corn at the distance of ten or fifteen yards from the fissure, was nearly full grown, and of the usual height, but the height regularly diminished until within five or six feet of the hill, where it attained but a few inches. This effect was owing to the great specific...
Página 346 - ... small part of plants ; but it is never entirely absent from any part of them. Even when it does not absolutely enter into the composition of a particular part or organ, it is always to be found in the fluids which pervade it. It follows from the facts thus far detailed, that the development of a plant requires the presence, first, of substances containing carbon and nitrogen, and capable of yielding these elements to the growing organism ; secondly, of water and its elements ; and lastly, of...
Página 144 - Linna-an herbarium were received from Kalm, or raised from seeds collected by him. Under the patronage of the Swedish government, this enterprising pupil of Linnaeus remained three years in this country, travelling throughout New York, New Jersey, Pennsylvania and Lower Canada : hence his plants are almost exclusively those of the Northern...
Página 350 - March, when the snow had a depth of 10 inches. Ammonia was set free from these crystals by the addition of hydrate of lime. The inferior layers of snow, which rested upon the ground, contained a quantity decidedly greater than those which formed the surface. It is worthy of observation, that the ammonia contained in rain and snow water, possessed an offensive smell of perspiration and animal excrements, — a fact which leaves no doubt respecting its origin.