Zoological Gardens.

It is stated that upwards of one hundred and eighty pounds have been received for the admission of the public to these gardens during one week.

We omitted to mention last week, that one of the lamas was presented by Robert Barclay, Esq. of Bury Hill; a leopard by Lord Auckland; several animals from the Arctic regions by the Hudson's Bay Company, &c. The pair of emus were bred at Windsor, by Lord Mountcharles. The emu is hunted in New South Wales for its oil; it frequently weighs 100 lbs., and its taste, when cooked, more resembles beef than fowl.—See Notes, p. 378, vol. xi. MIRROR.

Venerable Orange Tree.

There is an orange tree, still living and vigorous, in the orangery at Versailles, which is well ascertained to be above 400 years old. It is designated the Bourbon, having belonged to the celebrated constable of that name in the beginning of the 16th century, and been confiscated to the crown in 1522, at which time it was 100 years old. A crown is placed on the box in which it is planted, with this inscription, "Sown in 1421."

Thirty-four orange-trees have lately been received at Windsor, as a present from the king of France to George IV.

Potato Mortar.

M. Cadet-de-Vaux found mortar of lime and sand, and also that made from clay, greatly improved in durability by mixing boiled potatoes with it.

An Experimental Farm,

As a school of practical husbandry for a part of central France, has been formed by the celebrated AbbÉ de Pradt. It is situated about a league from Avranches, on the great road from that city to Bort, in the department of CorrÈze.—Foreign Q. Rev.

A Tunnel under the Vistula, at Warsaw,

Has been projected. This mode of communication will be of the utmost utility, especially at the times of the breaking up of the frost, when all intercourse is interrupted. The architect is a foreigner, and has engaged to complete the work in the space of three years.—Paris Paper.

Small White Slugs,

In gardens, are more injurious than the larger variety, because their diminutive size escapes the gardener's eye. A good way to keep them under is to make small holes, about an inch deep, and about the diameter of the little finger, round the plants which they infest. Into these holes the slugs will retreat during the day, and they may be killed there by dropping in a little salt, quicklime in powder, or by strong lime and water.—Gardener's Mag.

Turkish Method of Preserving Filberts.

When perfectly ripe, remove the husks, and dry the nuts, by rubbing with a coarse cloth; sprinkle the bottom of a stone jar with a very little salt; then place a layer of filberts, adding a small quantity of salt between each layer. The jar must be perfectly dry and clean. Secure the top from air, and keep them in a dry place; and, at the end of six months, they will peel.—Ibid.

Extinction of Fires.

When a chimney or flue is on fire, throw into the fire-place one handful after another of flower of sulphur. This, by its combustion, effects the decomposition of the atmospheric air, which is, in consequence, paralysed, or, in effect, annihilated.

Oysters.

After the month of May, it is felony to carry away the caltch (the spawn adhering to stones, old oyster-shells, &c.) and punishable to take any oysters, except those of the size of a half-crown piece, or such as, when the two shells are shut, will admit of a shilling rattling between them.

The liquor of the oyster contains incredible multitudes of small embryo oysters, covered with little shells, perfectly transparent, swimming nimbly about. One hundred and twenty of these in a row would extend one inch. Besides these young oysters, the liquor contains a great variety of animalcules, five hundred times less in size, which emit a phosphoric light. The list of inhabitants, however, does not conclude here, for besides these last mentioned, there are three distinct species of worms (called the oyster-worm,) half an inch long, found in oysters, which shine in the dark like glow-worms. The sea-star, cockles, and muscles, are the great enemies of the oyster. The first gets within the shell when they gape, and sucks them out.

While the tide is flowing, oysters lie with the hollow side downwards, but when it ebbs they turn on the other side. ⁶

Swarming of Bees.

An interesting communication was read, at a recent sitting of the Royal Society, from T.A. Knight, Esq. describing the precaution taken by a swarm of bees, in reconnoitering the situation where they intend to establish their new colony, or swarm from the parent hive. The bees do not go out in a considerable body, but they succeed each other in going and returning, until the whole of the swarm have apparently made good the survey, after which the whole body take their departure in a mass. If by any chance a large portion of a swarm take their departure without the queen bee, they never proceed to take up the ulterior quarters without her majesty's presence. The result of Mr. Knight's observations tends to prove, that all the operations of a swarm of bees are dictated by previous concert, and the most systematic arrangement.