Evenings at Home; Or, The Juvenile Budget Opened. John Aikin

Чтение книги онлайн.

СКАЧАТЬ that is a very great tree?

      Tut. It grows to a large size, but is slow in coming to its full growth.

      Geo. Are pines and firs very useful trees?

      Tut. Perhaps the most so of any. By much the greatest part of the wood at present used among us comes from them.

      Har. What—more than from the oak?

      Tut. Yes, much more. Almost all the timber used in building houses, for floors, beams, rafters, and roofs, is fir.

      Geo. Does it all grow in this country?

      Tut. Scarcely any of it. Norway, Sweden, and Russia, are the countries from which we draw our timber, and a vast trade there is in it. You have seen timber-yards?

      Geo. O yes—several.

      Tut. In them you would observe some very long thick beams, called balks. These are whole trees, only stripped of the bark and squared. You would also see great piles of planks and boards, of different lengths and thickness. Those are called deal, and are brought over ready sawn from the countries where they grow. They are of different colours. The white are chiefly from the fir-tree; the yellow and red from the pine.

      Har. I suppose there must be great forests of them in those countries, or else they could not send us so much.

      Tut. Yes: the mountains of Norway are overrun with them, enough for the supply of all Europe; but on account of their ruggedness, and the want of roads, it is found impossible to get the trees, when felled, down to the seacoast, unless they grow near some river.

      Geo. How do they manage then?

      Tut. They take the opportunity when the rivers are swelled with rains or melted snow, and tumble the trees into them, when they are carried down to the mouth of the rivers, where they are stopped by a kind of pens.

      Har. I should like to see them swimming down the stream.

      Tut. Yes—it would be curious enough; for in some places these torrents roll over rocks, making steep waterfalls, down which the trees are carried headlong, and do not rise again till they are got to a great distance; and many of them are broken, and torn to pieces in the passage.

      Geo. Are these woods used for anything besides building?

      Tut. For a variety of purposes; such as boxes, trunks, packing-cases, pales, wainscots, and the like. Deal is a very soft wood, easily worked, light, and cheap, which makes it preferred for so many uses, though it is not very durable, and is very liable to split.

      Har. Yes—I know my box is made of deal, and the lid is split all to pieces with driving nails into it.

      Geo. Are ships ever built with fir?

      Tut. It was one of the first woods made use of for naval purposes; and in the poets you will find the words pine and fir frequently employed to signify ship. But as navigation has improved, the stronger and more durable woods have generally taken its place. However, in the countries where fir is very plentiful, large ships are still built with it; for though they last but a short time, they cost so little in proportion, that the profit of a few voyages is sufficient to repay the expense. Then, from the great lightness of the wood, they swim higher in the water, and consequently will bear more loading. Most of the large ships that bring timber from Archangel, in Russia, are built of fir. As for the masts of ships, those I have already told you are all made of fir or pine, on account of their straightness and lightness.

      Geo. Are there not some lines in Milton’s Paradise Lost about that?

      Tut. Yes: the spear of Satan is magnified by a comparison with a lofty pine.

      His spear, to equal which the tallest pine,

      Hewn on Norwegian hills, to be the mast

      Of some great admiral, were but a wand.

      Har. I remember, too, that the walking-staff of the giant Polypheme was a pine.

      Tut. Ay—so Homer and Ovid tell us, and he must have been a giant indeed, to use such a stick. Well, so much for the wood of these trees. But I have more to say about their uses.

      Har. I am glad of it.

      Tut. All of the tribe contain a juice of a bitterish taste and strong fragrant smell. This, in some, is so abundant as to flow out from incisions; when it is called turpentine. The larch, in particular, yields a large quantity. Turpentine is one of the substances called resinous; it is sticky, transparent, very inflammable, and will not mix with water, but will dissolve in spirits of wine.

      Geo. What is it used for?

      Tut. It is used medicinally, particularly in the composition of plasters and ointments. It also is an ingredient in varnishes, cements, and the like. An oil distilled from turpentine is employed in medicine, and is much used by painters for mixing up their colours. What remains after getting this oil is common resin. All these substances take fire very easily, and burn with a great flame; and the wood of the pine has so much of this quality, when dry, that it is often used for torches.

      Har. I know deal shavings burn very briskly.

      Geo. Yes; and matches are made of bits of deal dipped in brimstone.

      Tut. True,—and when it was the custom to burn the bodies of the dead, as you read in Homer and other old authors, the pines and pitch-trees composed great part of the funeral pile.

      Har. But what are pitch-trees? Does pitch grow upon trees?

      Tut. I was going on to tell you about that. Tar is a product of the trees of this kind, especially of one species, called the pitch-pine. The wood is burnt in a sort of oven made in the earth, and the resinous juice sweats out, and acquires a peculiar taste and a black colour from the fire. This is tar. Tar when boiled down to dryness becomes pitch.

      Geo. Tar and pitch are chiefly used about ships; are they not?

      Tut. They resist moisture, and therefore are of great service in preventing things from decaying that are exposed to wet. For this reason, the cables and other ropes of ships are well soaked with tar; and the sides of ships are covered with pitch mixed with other ingredients. Their seams, too, or the places where the planks join, are filled with tow dipped in a composition of resin, tallow, and pitch, to keep out the water. Wood for paling, for piles, for coverings of roofs and other purposes of the like nature, is often tarred over. Cisterns and casks are pitched to prevent leaking.

      Har. But what are sheep tarred for after they are sheared?

      Tut. To cure wounds and sores in their skin. For the like purposes an ointment made with tar is often rubbed upon children’s heads. Several parts of the pine are medicinal. The tops and green cones of the spruce-fir are fermented with treacle, and the liquor, called spruce-beer, is much drunk in America, particularly for the scurvy.

      Geo. Is it pleasant?

      Tut. Not to those who are unaccustomed to it. Well—I have now finished my lesson, so let us walk.

СКАЧАТЬ