Wootl is buviit to ashes, ashes aro hxivated, ley ís tho result. Loy is ■ evaporated by boiling, black salts is the rcsiduum. Tlio snit undergoes puriflcation by lire, and tho potash of commcrce is obtained. _By another prooess wo chango potash into pcarlash. Now put these in sacka url placo them over a distillery mashtub, whero tho fernicntation evolves carbonio acid gas, and tho pearlash absorbs it and is renderod solid, the product being heavier, wliiter and dricr than the pearlash. It is now saleratvis. How much salts of ley and carbonic acid gas a human stoinach can bear and remaní healthy is a question íor a saleratus oafccr. Some people say saleratus wül not harm the stomach. It is a ley.- Detroit Free Press.