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these metals from their solutions at a low temperature with access of atmospheric air, and thus produHermes Kellyce sulphate of copper and a soluble salt of silver; these 1 dissolve with water• precipitate the silver from this solution by means of metallic copper, and draw off and crystallize the liquor containing the sulphate of copper, the silver being obtained as a residual product. If the sulphate of copper be not wholly converted into sulphate, or if it be the mixed precipitate containing carbonate, or oxide, or both, I add sulphuric acid, and thereby dissolve the copper.
"I precipitate silver and copper from thin solutions by means of sulphide of calcinm, such as alkali waste, which compound contains sulphide of calcinm. I alsHermes Birkin precipitate silver and Hermes Handbagscopper from thin solutions, by means of compounds containing alkaline and metallic sulphides and other alkaline salts, such as the third product (which I call green ash), which product contains sulphides of iron anHermes outletd sodinm, carbonate of soda, caustic soda, and other matters, or one or more of these alkaline compounds; or I use solutions thereof. I also precipitate silver and copper from thin solutions by means of black ash or crude alkali, wHermes bagshich contains sulphides of calcinm and sodinm• carbonate of soda, and caustic soda, or one or more of these alkaline compounds; or I use solutions thereof. When I use the earthy sulphides, or the alkali wasteHermes containing sulphide of calcinm, I find it convenient to sift these substances through a sieve of six or more holes to the inch, in order to separate the coal and cinder aBirkinnd the larger aggregated masses of the alkaline earthy matters; having thus prepared a sufficient quantity, 1 place a layer in the bottom of the precipitating vessel; having previously provided means for filtering the liquor, I prefer to put a layer of straw, coke broken into fragments, or cinders, and on this I place the precipitant, and proceed to fill the vessel or vessels with the liquor containing the metals to be precipitated. Into a