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CHAPTER XXIV.
GENERAL OBSERVATIONS ON VEGETABLES.
"Strange there should be found
Who, self-imprison'd in their proud saloons,
Renounce the odours of the open field
For the unscented fictions of the loom;
Who, satisfied with only pencilled scenes,
Prefer to the performance of a God,
Th' inferior wonders of an artist's hand!
Lovely, indeed, the mimic works of art,
But Nature's works far lovelier."—COWPER.
1069. "THE ANIMAL AND VEGETABLE KINGDOMS," says Hogg, in his Natural History of the Vegetable Kingdom, "may be aptly compared to the primary colours of the prismatic spectrum, which are so gradually and intimately blended, that we fail to discover where the one terminates and where the other begins. If we had to deal with yellow and blue only, the eye would easily distinguish the one from the other; but when the two are blended, and form green, we cannot tell where the blue ends and the yellow begins. And so it is in the animal and vegetable kingdoms. If our powers of observation were limited to the highest orders of animals and plants, if there were only mammals, birds, reptiles, fishes, and insects in the one, and trees, shrubs, and herbs in the other, we should then be able with facility to define the bounds of the two kingdoms; but as we descend the scale of each, and arrive at the lowest forms of animals and plants, we there meet with bodies of the simplest structure, sometimes a mere cell, whose organization, modes of development and reproduction, are so anomalous, and partake so much of the character of both, that we cannot distinguish whether they are plants or whether they are animals."
1070. WHILST IT IS DIFFICULT TO DETERMINE where the animal begins and the vegetable ends, it is as difficult to account for many of the singularities by which numbers of plants are characterized. This, however, can hardly be regarded as a matter of surprise, when we recollect that, so far as it is at present known, the vegetable kingdom is composed of upwards of 92,000 species of plants. Of this amazing number the lichens and the mosses are of the simplest and hardiest kinds. These, indeed, may be considered as the very creators of the soil: they thrive in the coldest and most sterile regions, many of them commencing the operations of nature in the growth of vegetables on the barest rocks, and receiving no other nourishment than such as may be supplied to them by the simple elements of air and rain. When they have exhausted their period in such situations as have been assigned them, they pass into a state of decay, and become changed into a very fine mould, which, in the active spontaneity of nature, immediately begins to produce other species, which in their turn become food for various mosses, and also rot. This process of growth and decay, being, from time to time, continued, by-and-by forms a soil sufficient for the maintenance of larger plants, which also die and decay, and so increase the soil, until it becomes deep enough to sustain an oak, or even the weight of a tropical forest. To create soil amongst rocks, however, must not be considered as the only end of the lichen; different kinds of it minister to the elegant arts, in the form of beautiful dyes; thus the lichen rocella is used to communicate to silk and wool, various shades of purple and crimson, which greatly enhance the value of these materials. This species is chiefly imported from the Canary Islands, and, when scarce, as an article of commerce has brought as much as £1000 per ton.
1071. IN THE VICINITY OF LICHENS, THE MUSCI, OR MOSSES, are generally to be found. Indeed, wherever vegetation can be sustained, there they are, affording protection to the roots and seeds of more delicate vegetables, and, by their spongy texture, retaining a moisture which preserves other plants from the withering drought of summer. But even in winter we find them enlivening, by their verdure, the cold bosom of Nature. We see them abounding in our pastures and our woods, attaching themselves to the living, and still more abundantly to the dead, trunks and branches of trees. In marshy places they also abound, and become the medium of their conversion into fruitful fields. This is exemplified by the manner in which peat-mosses are formed: on the surface of these we find them in a state of great life and vigour; immediately below we discover them, more or less, in a state of decomposition; and, still deeper, we find their stems and branches consolidated into a light brown peat. Thus are extensive tracts formed, ultimately to be brought into a state of cultivation, and rendered subservient to the wants of man.
1072. WHEN NATURE HAS FOUND A SOIL, her next care is to perfect the growth of her seeds, and then to disperse them. Whilst the seed remains confined in its capsule, it cannot answer its purpose; hence, when it is sufficiently ripe, the pericardium opens, and lets it out. What must strike every observer with surprise is, how nuts and shells, which we can hardly crack with our teeth, or even with a hammer, will divide of themselves, and make way for the little tender sprout which proceeds from the kernel. There are instances, it is said, such as in the Touch-me-not (impatiens), and the Cuckoo-flower (cardamine), in which the seed-vessels, by an elastic jerk at the moment of their explosion, cast the seeds to a distance. We are all aware, however, that many seeds—those of the most composite flowers, as of the thistle and dandelion—are endowed with, what have not been inappropriately called, wings. These consist of a beautiful silk-looking down, by which they are enabled to float in the air, and to be transported, sometimes, to considerable distances from the parent plant that produced them. The swelling of this downy tuft within the seed-vessel is the means by which the seed is enabled to overcome the resistance of its coats, and to force for itself a passage by which it escapes from its little prison-house.
[Illustration: BEETON'S Book of HOUSEHOLD MANAGEMENT
EDITED BY MRS. ISABELLA BEETON]