The Mannesmann process of twisting heated metallic bara into tubes by means of rollers imparting an unequal rotation along length of the metal, is pronounced an epoch-making invention" by one of the reatest of German mechanical engineers. by various tests, is probably due to the fact he strength of these tubes, as shown
that, in addition to being much more worked than by other processes, the metal has its fibres disposed spirally. "Tu testa at the Mannesmann works, at Komotau, Hungary, more than 600 tons of 3-inci and 4-inch tubes, with an average thickness of inch, have successfully resisted a pressure of 2,000 pounds per square inch, Welded tubes ure not safe above 1,000 pounds per square inch, and cast iron ones of this size will hardly stand 200 pounds. That the Man-neumann tubes may be made in considerable lengths is shown by the recent production of 1 3-inch tube 70 feet lon, In the limits of the United States are found 413 species of trees, of which 16, when thoroughly dried, will sink in water. The black ironwood Condelia terra is the heaviest of all, being more tian 30 per cent. heavier than water. Tt grows only in southern Florida, and all other species heavier than water are confined to the hot and dry regions of the country.
Exposed parts of the Scuttish coast are sometimes hammered with a force of a for and a half to the'square foot by waves the. German Ocean, and with a force of 3 tons on the Atlantic side. At Skerryvole lighthouse, on 3rd March of this year, a Dlock of limestone weighing 15 tons was moved more than 150 feet from a place in the surf to which it was lifted in a similar gale in 1697. parasitic in' tubercular and scrofulous affections. The eucalyptus honey is very pleasant to the taste, and 1,000 parts of it contain 171 parts vf active principles, cluding eucalyptol, eucalyptene, terpine, and odorous, resinous and colouring matters.
The chances of resuscitation in a case of drowning, according to Dr, Clark, depend greatly on whether the plunge into the Water was suicidal or accidental, A suicide cannot be saved after 5 minutes of submergence, but the accidentally drowned may" be submerged 20 and possibly: 30 mitiutes, and yet be resuscitated.
A prize offered by the French Minister of War for the quickest pigeon flight from Perigueux to Paris, 310 miles, was won in hourd and 34 minutes, There were 2,746 entries in the race.
he luminous buoy of M. Dibos has been ied in France, and seen at a distance of 4 miles, he Marjelen Lake, at a height of 8,000 [feet in Upper Valois, Switzerland, enjoys the unique distinction of being formed by the damming of the valley by a glacier. The surplus water from this Luke usually escapes through underground channels, but sometimes accumulates to such an extent that the ice barrier is burst, and the luke temporarily disappears. Ose of these periodical emptyings lately occurred, and fran witueasod by a peasnht, who chanced to be very near. As the ice dam broke, the vast tins of water swept out, carrying away huge fragments of ice and rock, tumbling into the crevasses, bursting them up in turn, and rising up over [lower end of the glacier the valley was the glacier in At the gigantic wave very yarrow, and here the water again pushed through the obstructing ice—though several hundred feet thick—with a deafening crash, and finally plunged down into the Rhone. A canal is being constructed in the hope that it may put an end to these outbursts.
An interesting bush, resembling Spanish broom, been discovered on the west coast of Africa by two German naturalists, They have named the plant Polyyala butyrace, but it is known to the natives as Malonkaug ur Ankslaki. The seeds yield 17.5 percent. of a yellowish, nutty-favored fat, which softens at about 85 degrees F. but does not become fluid below 125 d grees, and which would serve as an exc Tent substitute for butter. The fat does not easily become rancid.
'A curious farinaceous substance is reported by M. Rane de Champagne to have fallen in Asiatic Turkey during a hailstorm,
Text read from the printed page and cleaned; old type leaves the occasional error.