SELTZER WATER, is a mineral water which springs up at Lower Seltzer, a village in the electorate of Triers, about 10 miles from Frankfort on the Mayne. It is a very useful medicinal water. It contains a very small portion of a calcareous earth, of a native mineral alkali, and an acid; but of these the quantity is too small to attribute any medicinal virtues to; but it contains also near 1-7th of its bulk of fixed air, which is more than is found in any other mineral water, and to this it owes its principal virtues.