_Treatment of Waste._--The following facts are supplied by Mr. T. J. Baker:--Sheet iron scrap and lathe turnings are worked up again into sheet iron. Copper clippings and turnings are remelted. Copper scale is resmelted, as also brass clippings and brass dust. Gold scrap of the japanning department is sent to the gold refiners, and the leaf metal scrap to the bronze powder manufacturers. Tin plate scrap, after the larger pieces have been sold to the button makers, are “stripped”--that is, the tin is removed by immersion in hydrochloric acid. The resulting tin salt is used by calico printers. The iron scrap, after removal of the tin, is used for precipitating copper by the wet process. Tin oxide, known as “drop tin,” formed on the surface of the metal in the tinning pot, is, after recovery of as much of the tin as possible, sent to the tin smelter. Galvanizing dross, an alloy of zinc and iron, which sinks to the bottom of the galvanizing bath, is removed by a perforated ladle, and refined by distilling off the zinc. Zinc ashes, that is cinders which have fallen on the molten metal and absorbed zinc, is also refined by distillation. Flux skimmings, or that which is skimmed off from the galvanizing bath, is an oxide and chloride of zinc. This is put in a vat; stirred with hot water, the oxide falls to the bottom of the vat, but the chloride dissolves. The clear solution is heated with gas liquor, when zinc precipitates as carbonate, and the chloride of ammonium, now in solution, is recovered by evaporation. The solid residues are worked up in paint mills into zinc white. =Tools (Heavy Edge).=--[A. WINKLER WILLS.]--(B. 656.) In addition to edge tools proper, such as axes, adzes, hatchets, and other articles, the trade includes pickaxes, spades, shovels, forks, hoes, augers, trowels, shipscrapers, &c. The number of patterns regularly supplied by the manufacturers of Birmingham and the neighbourhood is estimated at several thousands, each nation and almost each district requiring special patterns of its own. The character of the soil, habit of people and other circumstances affect the form of tool though used for the same purpose. The enormous hoe, with a blade nearly a foot wide and of the same depth, which is in universal use in Guatemala, would be useless in Valparaiso, because the soil is light in one country and heavy in the other.