According to M. Landgerbe, a mixture of two parts nitre, two parts neutral carbonate of potash, one part of sulphur, and six parts of common salt, all finely pulverized, makes a very powerful fulminating powder. M. Landgerbe adopts the extraordinary error of supposing that these preparations act with more force downwards than in any other direction.--_Bull. Univ._ _Aurora Borealis._ An aurora borealis was seen from North End, Hampstead, near London, from about seven o'clock until eleven, on the evening of Dec. 1. It generally appeared as a light resembling twilight, but shifting about both to the east and the west of north, and occasionally forming streams which continued for several minutes, and extended from 30 to 40 degrees high. The light on the horizon was not more than 12 or 15 degrees in height.--_Brande's Journal._ _Paper Linen._ According to the Paris papers, a new invention, called _papier linge_, has lately attracted much attention. It consists of a paper made closely to resemble damask and other linen, not only to the eye, but even to the touch. The articles are used for every purpose to which linen is applicable, except those requiring much strength and durability. The price is low, a napkin costs only five or six centimes (about a halfpenny), and when dirty, they are taken back at half-price. A good sized table-cloth sells for a franc, and a roll of paper with one or two colours for papering rooms or for bed curtains, may be had for the same price. _Maturation of Wine._ M. de St. Vincent, of Havre, states, from his own experience of long continuance, that when bottles containing wine are closed by tying a piece of parchment or bladder over their mouths, instead of using corks in the ordinary manner, the wine acquires, in a few weeks only, those qualities which is only given by age in the ordinary way after many years.--_Nouveau Jour, de Paris._ _Indications of Wholesomeness in Mushrooms._