Spirit of Discovery.
Altitude of certain Buildings.
metres.
The highest Pyramid in Egypt- - - - - - - - - - - -146
The Cathedral at Anvers - - - - - - - - - - - - - 144
The Cathedral at Strasburg - - - - - - - - - - - - 142
The Steeple of St. Stephen, at Vienna, (Austria) - 138
The Steeple of St. Martin, at Landshut - - - - - - 137
St. Peter's, at Rome - - - - - - - - - - - - - - -132
The Steeple of St. Michael, at Hamboro' - - - - - 130.5
The Steeple of St. Peter, at Hamboro' - - - - - - 119
St. Paul's Cathedral, at London - - - - - - - - - 109.7
The Cathedral of Ulm - - - - - - - - - - - - - - -109.4
The Cathedral of Milan - - - - - - - - - - - - - 109
The Tower of the Asinelli, at Bologna - - - - - - 107
The Dome of the Invalids, at Paris - - - - - - - - 105
The Cathedral of Magdebourg - - - - - - - - - - - -101.6
The Cupola of the Pantheon, at Paris - - - - - - - 79
The Balustrade of Notre Dame, at Paris - - - - - - 66
The metre is 39.37 inches.—From the French.
Prevention of Fire in Theatres.
In consequence of the frequent occurrence of fires in theatres, particular precautions have been taken with the theatre of the Port St. Martin, at Paris. A thick wall of hewn stone separates the audience part from the scenic part of the house; all the doors in it are of iron, and may be shut instantly, in case of fire; finally, the insulation of the spectators from the stage is made perfect by means of a screen of plates of iron, which falls down before the stage. This screen, which weighs between 1,200 and 1,300 pounds, is easily worked by two men, and slides up and down upon guides, so as readily to take its place. Besides these precautions, reservoirs of water are established in the roof, which may be connected, when necessary, with vessels of compressed air, and made to throw a powerful jet over a very large part of the building.—French Paper.
Tanning.
A tanner, named Rapedius, of Bern Castel, on the Moselle, has discovered a new species of tan proper for dressing leather. It is the plant known by the name of Bilberry or Whortleberry, (Vaccinium Myrtilus or Myrtillis,) which should be gathered in spring, because at this season it dries more readily, and is more easily ground. Three pounds and a half of this tan suffice for dressing a pound of leather, while six pounds are required from the oak to produce the same effect. By this new process, tanners can gain four months out of the time required for preparing strong leather. A commission having been appointed at Treves to examine the leather so prepared, reported, that they had never seen any as good, and that every pair of shoes made therefrom lasts two months more than what are manufactured from common leather; that the skin of the neck, which it is difficult to work, becomes strong and elastic like that of the other parts. The shrub should not be pulled up, but cut with a bill, to obtain the reproduction of the plant the following year. When cut, damp does not deteriorate it, which is not the case with oak bark, which loses ten per cent. of its value by being wetted.—From the French.
Spiders.
It would be very interesting to know whether the gossamer threads thrown out by these insects are in an excited state of electricity: their divergent state would seem to imply they were; for there seems to be no other natural cause which could prevent them from coming together, especially before the insect had left its resting-place. If electric, then neighbouring bodies, as the hand or branches of a tree, or a stick, &c., would attract them; but care would be required in making the experiment, from the readiness with which these threads would move upon disturbance of the air. If electric, then it would be important to know whether they were positive or negative; which their attraction, or repulsion, by a stick of sealing-wax, rubbed on the sleeve of a coat, would at once determine. It is well known that these threads are almost perfect insulators of electricity, and would retain a charged state for a long time in a dry sunny atmosphere.—Brande's Journal.
Method of obtaining Roses of all kinds twice in the Year.
The following directions, by M. Douette Richardot, are to enable the amateur to gather as fine roses in September as he did in the preceding June:—1. Immediately after the first flowering, the shrub is to be deprived of every leaf, and those branches which have borne roses cut so that only two or three buds shall remain. The cutting of the weaker branches may be in a less degree. If the weather be dry when the leaves are removed, it will be necessary to thoroughly water the stem, for several days, with the rose of the watering-pot: in this way the sap will not be arrested. 2. Then the brush is to be used, and the rose tree well cleansed by it, so that all mouldiness shall disappear: this operation is very easy after an abundant rain. 3. The earth about the rose tree is to be disturbed, and then twenty-four sockets of calves' feet are to be placed in the earth round the stem, and about four inches distant from it. The hoofs of young calves are the best, and give a vivid colour and agreeable perfume to the roses. These are to be placed with the points downwards, so that the cups shall be nearly level with the surface of the earth, and the plant well surrounded. This operation is to be repeated in the November following. These hoofs, dissolved by the rain or the waterings, form an excellent manure, which hastens the vegetation, and determines the reproduction of flowers. 4. Two waterings per week will suffice in ordinary weather, and they should be made with the rose of the watering-pot, so that the hoofs may be filled; but, if the atmosphere is dry, it will be necessary to water the plants every evening; and in the latter case it will be necessary, from time to time, to direct the stream of water on to the head of the tree.—From the French.
American Sea-Serpent.
Mr. Samuel Mitchell has, in his "Summary of the Progress of Natural Science for the last few Years," given an amusing account of the progress of sea-serpentism. It was read before the New York Lyceum, and is inserted in the American Journal of Science, although not thought conclusive by its learned editor, Dr. Silliman. The first sea-serpent was a steam-boat, which, being established at Boston to coast along the shore, and from its powers and capabilities competent to injure the business of small boats, was described as a sea-serpent that had been seen off Nahant and Gloucester, and had probably come there to consume all the small fish in the place. This was received by many as a serious account, and believed accordingly.
Another sea-serpent history arose from the circumstance, that a small sloop, called the Sea-Serpent, having been passed by another vessel, the captain of the latter, when asked, upon his arrival at home, for news, said he had seen a sea-serpent, and then described its bunches on the back, the action of its tail, and other parts; all of which being understood literally, actually appeared in print, as evidence for the existence of the animal.
Then a piece of the skin of the bony scaled pike was taken for part of a sea-serpent's hide. A speckled mother duck, with a numerous brood of young ones swimming after her in a line on Lake Ontario, was described as the sea-serpent itself. And from such occurrences as these, perhaps, mingled with careless observation of the motions and appearances of porpuses, basking sharks, and balænopterous whales, appears to have originated every thing that has been said about American sea-serpents.—Brande's Jour.