Wakmino Chukches by Gas.—The following method ha been patented in England. A brick chamber is made be neath the floor of the building, and a grating is placed ove it to allow of the passage of hot air. Beneath this chambe an air flue in connection with the flooring, and covered witl an iron grating, is introduced. By these means a current o air is made to pass into the building, and this air is brough into contact with a ring gas burner, which is supplied by ai ordinary main by means of a spanner, by which the amoun of heat can be regulated. Underneath this ring-burner ii placed a small cistern made of flre-clay, fllled with water the heat from the gas burner acts upon the water, stean arises, and this is passed through pumicestone contained ii a cylinder above the cistern; the use of this vapor is t( moisten the atmosphere contained in the reservoir. Arounc this is a circular cylinder made of flre-clay, to contain heat The whole is covered with a dome of fire-clay. This dome ii worked by a lever for the purpose of lighting the ring-burner. By these arrangements, it is said that a pure heat free from smell or smoke, is obtained, and that with a ver] small consumption of gas. A Novel Nut Ckacker.—Two inventors in England have taken out a patent for cracking palm nuts, in order to re move the shell previously to submitting the kernels to the action of the press for extracting the oil; but it may also be ased for the purpose of cracking any other kind of nuts thai are required to be cracked in large quantities. A revolving an is used for producing a blast of air which throws the nul with sufficient force against aa iron or metal target to cract them without injuring the kernels. The fan is inclosed in a sheet of iron, or other suitable case, having an entrance pas sage, provided with a hopper for the introduction of the nuts md a discharge pipe through which they are driven by a mrrent of air, and discharged against the iron target, bj striking which they are broken. Steam ENGiNEEEiiirG at the Fkbnch Exposition.—We are indebted to the courtesy of William S. Anchincloss, C. E., Honorary Commissioner to the French Exposition of 1867 and author of an able work on " Link and Valve Motions,' recently noticed at length in this journal, for a copy of his re port on Steam Engineering, as illustrated by the Paris Uni" versal Exposition of 1867. An extract entitled Transmission Df Power, published in another' column, is one of the many ood things we find in this interesting work. It is to be regretted that so limited a number of copies of this report have been published, as the information it contains is of high value ;o American Engineers. We shall make some other extracts :rom this valuable report. Taepaulik.—A new method for making a durable and iseful tarpaulin, consists in boiling gas tar, one hundred, veight, until it becomes hard, and at the same time boiling n a steam-jacketed pot fourteen gallons of Stockholm tar pirit, ten pounds of American resin, and one gallon of resin il. When these ingredients are completely dissolved, they re mixed together, and in about ten minutes after, two unces of oil of vitriol are added. This compound is found to reserve tarpaulins, sail cloth, and other fabrics. By the ad-ition of proper pigments it can be made to receive different ints of dark colors, such as reds and browns. Tooth Bkushes.—There has lately been introduced into he market a porous form of vulcanized india-rubber, called idia-rubber sponge. It is proposed to substitute this materi-1 for bristles in the manufacture of tooth-brushes. A piece f india-rubber sponge is fixed to a handle of bone or ivory, nd ridges are formed on the surface of the spongy material ther brushes are made in a similar manner by fixing spongy-ulcanizad india-rubber to a rigid back or handle; or, in some ases, as for horse brushes, a rigid back only is required. In Dme cases, the spongy india-rubber is checkered or cross-rooved. PoisoninCt by Cokalline.—M. Landrin has reported ex-eriments to the French Academy, tending to show that pure Dralline does not exert any poisonous action on the human k:in. M. Tardieu rejoins, that the coralline-dyed stockings hich he examined, and which did produce such effects, did ot contain arsenic, lead, mercury, or other mineral poisons, ut he cannot say whether or not the stockings were colored ith coralline only. So the question stands in a position of ncertainty ae to the real cme of tbo mischief imputed to lis pretty dye, i New Gas Bukner.—A new French invention is a gas-r burner, the object of which is in part to do away with the b flickering of the flame, so as to render the light steady, also l to cause a more perfect combustion of the carbon. It consists i of a metal piece having several openings, through some of l which gas issues, and through the others atmospheric air, . which mixes with the gas. It appears to be a modification , of the ordinary Bunsen burner. ; Steel Fishing Rods.—It is proposed by an English in- venter to make fishing rods of iron, steel, or German silver, instead of pliable wood or cane. He constructs the rods as follows—either in one or several pieces, connecting them to-r get her by joints in the usual way or by any other means better adapted for the purpose. He uses either solid or tubular metal with the view to obtaining lightness and flexibility.