ARCANA OF SCIENCE.

_Black And White Swans._

A few weeks since a _black swan_ was killed by his white companions, in

the neighbourhood of London. Of this extraordinary circumstance, an

eye-witness gives the following account:--

I was walking, between four and five o'clock on Saturday afternoon, in

the Regent's Park, when my attention was attracted by an unusual noise

on the water, which I soon ascertained to arise from a furious attack

made by two white swans on the solitary black one. The _allied_ couple

pursued with the greatest ferocity the unfortunate _rara avis_, and one

of them succeeded in getting the neck of his enemy between his bill, and

shaking it violently. The poor black with difficulty extricated himself

from this murderous grasp, hurried on shore, tottered a few paces from

the water's edge, and fell. His death appeared to be attended with great

agony, stretching his neck in the air, fluttering his wings, and

attempting to rise from the ground. At length, after about five minutes

of suffering, he made a last effort to rise, and fell with outstretched

neck and wings. One of the keepers came up at the moment, and found the

poor bird dead. It is remarkable, that his foes never left the water in

pursuit, but continued sailing up and down to the spot wherein their

victim fell, with every feather on end, and apparently proud of their

conquest.

_Fascination Of Snakes._

I have often heard stories about the power that snakes have to charm

birds and animals, which, to say the least, I always treated with the

coldness of scepticism, nor could I believe them until convinced by

ocular demonstration. A case occurred in Williamsburgh, Massachussets,

one mile south of the house of public worship, by the way-side, in July

last. As I was walking in the road at noon-day, my attention was drawn

to the fence by the fluttering and hopping of a robin red-breast, and a

cat-bird, which, upon my approach, flew up, and perched on a sapling two

or three rods distant; at this instant a large black snake reared his

head from the ground near the fence. I immediately stepped back a

little, and sat down upon an eminence; the snake in a few moments slunk

again to the earth, with a calm, placid appearance; and the birds soon

after returned, and lighted upon the ground near the snake, first

stretching their wings upon the ground, and spreading their tails, they

commenced fluttering round the snake, drawing nearer at almost every

step, until they stepped near or across the snake, which would often

move a little, or throw himself into a different posture, apparently to

seize his prey; which movements, I noticed, seemed to frighten the

birds, and they would veer off a few feet, but return again as soon as

the snake was motionless. All that was wanting for the snake to secure

the victims seemed to be, that the birds should pass near his head,

which they would probably have soon done, but at this moment a wagon

drove up and stopped. This frightened the snake, and it crawled across

the fence into the grass: notwithstanding, the birds flew over the fence

into the grass also, and appeared to be bewitched, to flutter around

their charmer, and it was not until an attempt was made to kill the

snake that the birds would avail themselves of their wings, and fly into

a forest one hundred rods distant. The movements of the birds while

around the snake seemed to be voluntary, and without the least

constraint; nor did they utter any distressing cries, or appear enraged,

as I have often seen them when squirrels, hawks, and mischievous boys

attempted to rob their nests, or catch their young ones; but they seemed

to be drawn by some allurement or enticement, and not by any

constraining or provoking power; indeed, I thoroughly searched all the

fences and trees in the vicinity, to find some nest or young birds, but

could find none. What this fascinating power is, whether it be the look

or effluvium, or the singing by the vibration of the tail of the snake,

or anything else, I will not attempt to determine--possibly this power

may be owing to different causes in different kinds of snakes. But so

far as the black snake is concerned, _it seems to be nothing more than

an enticement or allurement with which the snake is endowed to procure

his fowl_.--_Professor Silliman's Journal_.

_Boring Marine Animals._

The most destructive of these is the _Teredo Navalis_, a fine specimen

of which was exhibited at a recent meeting of the Portsmouth

Philosophical Society. This animal has been said to extend the whole

length of the boring tube; but this assertion is erroneous, since the

tubes are formed by a secretion from the body of the animal, and are

often many feet in length, and circuitous in their course. This was

shown to be the fact, by a large piece of wood pierced in all

directions. The manner in which it affects its passage, and the interior

of the tubes, were also described. The assertion that the _Teredo_ does

not attack teak timber was disproved; and its destructive ravages on the

bottom of ships exemplified, by a relation of the providential escape of

his majesty's ship Sceptre, which having lost some copper from off her

bows, the timbers were pierced through to such an extent as to render

her incapable of pursuing her voyage without repair.

_Anthracite, or Stone Coal._

Professor Silliman's last journal contains a very important article,

illustrative of the practical application of this mineral; and the vast

quantities of it that may be found in Great Britain renders the

information highly valuable to our manufacturing interests. In no part

of the world is anthracite, so valuable in the arts and for economical

purposes, found so abundantly as in Pennsylvania. For the manufacture of

iron this fuel is peculiarly advantageous, as it embraces little sulphur

or other injurious ingredients; produces an intense steady heat; and,

for most operations, it is equal, if not superior to coke. Bar iron,

anchors, chains, steamboat machinery, and wrought-iron of every

description, has more tenacity and malleability, with less waste of

metal, when fabricated by anthracite, than by the aid of bituminous coal

or charcoal, with a diminution of fifty per cent. in the expense of

labour and fuel. For breweries, distilleries, and the raising of steam,

anthracite coal is decidedly preferable to other fuel, the heat being

more steady and manageable, and the boilers less corroded by sulphureous

acid, while no bad effects are produced by smoke and bitumen. The

anthracite of Pennsylvania is located between the Blue Bridge and

Susquehannah; and has not hitherto been found in other parts of the

state, except in the valley of Wyoming.

_Holly Hedges._

At Tynningham, the residence of the Earl of Harrington, are holly hedges

extending 2,952 yards, in some cases 13 feet broad and 25 feet high. The

age of these hedges is something more than a century. At the same place

are individual trees of a size quite unknown in these southern

districts. One tree measures 5 feet 3 in. in circumference at 3 feet

from the ground; the stem is clear of branches to the height of 14 feet,

and the total height of the tree is 54 feet. At Colinton House, the seat

of Sir David Forbes; Hopetown House, and Gordon Castle are also several

large groups of hollies, apparently planted by the hand of

Nature.--_Trans. Horticultural Society_.

_Egg Plants._

In this country, the egg plant, brinjal, or aubergine, is chiefly

cultivated as a curiosity; but in warmer climates, where its growth is

attended with less trouble, it is a favourite article of the kitchen

garden. In the form of fritters, or farces, or in soups, it is

frequently brought to table in all the southern parts of Europe, and

forms a pleasant variety of esculent.--Ibid.

_Vinegar Made From Black Ants._

It is singular enough, that a discovery of modern chemistry should long

have been practically employed in some parts of Norway, for the purpose

of making vinegar from a large species of black ant. The method employed

in Norlanden is simply this: they first collect a sufficient quantity of

these little animals, by plunging a bottle partly filled with water up

to the neck in one of the large ant-hills; into which they naturally

creep, and are drowned. The contents are then boiled together, and the

acid thus produced is made use of by the inhabitants as _vinegar_, being

strong and good.

_Soil For Fruit Trees._

Low grounds that form the banks of rivers are, of all others, the best

adapted for the growth of fruit trees; the alluvial soil of which they

are composed, being an intermixture of the richest and most soluble

parts of the neighbouring lands, with a portion of animal and vegetable

matter, affording an inexhaustible store of nourishment--_Trans.

Horticultural Society_.

_Watch Alarum._

A patent has recently been procured for a most useful appendage to a

watch, for giving alarm at any hour during the night. Instead of

encumbering a watch designed to be worn in the pocket with the striking

apparatus, (by which it would be increased to double the ordinary

thickness), this ingenious invention has the alarum or striking part

detached, and forming a bed on which the watch is to be laid; a

communication being made by a lever, projecting through the watch case,

to connect the works. This appendage is described to be applicable to

any watch of the usual construction, and is by no means expensive.

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The Mirror of Literature, Amusement, and Instruction. Volume 10, No. 282, November 10, 1827 · 第 17 / 37 题