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Few of our native trees are more useful for fuel, and the manufacture of potash; and as the means of affording a great and almost inexhaustible supply of sugar, it becomes an object of great importance, even to the farmer, who is desirous of transmitting a valuable inheritance to his children. It is my intention to plant this tree in the place of a line of the Athenian poplars, which I have been obliged to cut down after eight years luxuriant growth, from their injurious effect on the adjoining fields, by the extension of their roots to sixty and seventy feet, throwing up a little forest of suckers.
Theory of Vegetation.
See Priestly's Experiments and Observations on different kinds of Air, begun in 1767.
Recherches chemiques sur la vegetation, chap. ii.
This was a discovery of Sennebier.
When deprived of light, plants are pale, lax and dropsical; restored to it, they recover their colour, consistency and odour. If a plant be placed in a cellar, into which is admitted a small portion of light through a window or cranny, thither the plant directs its growth, and even acquires an unnatural length in its attempt to reach it. These facts admitted, no one can doubt the agency of light in vegetation; but in relation to this agency, various opinions exist; one, that light enters vegetable matter, and combines with it; another, that it makes no part either of the vegetable or of its aliment, but directly influences substances which are alimentary; and a third, that besides the last effect, it stimulates the organs of plants to the exercise of their natural functions.
It is by a knowledge of this fact, that gardeners bleach chicony and cellery, &c.
See Fourcroy, vol. viii.
See Chaptal on vegetation.
Knight's Observations, &c.
Davy's Elements.
MANURES OF GREEN CROPS.
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