Bicarbonate of sodium is the chemical name of the article which is used in baking and washing, as well as in medicine. It is an excellent and not disagreeable antacid, relieving sourness of stomach, and often nausea (sickness of stomach) better than anything else. For such a use it may be taken, in small quantities. What would cover a little finger nail, if it would hold it - a pinch we may say - is an ordinary antacid dose, although twice as much may be taken for a single time. It is often prescribed by physicians for gravel.

Soda water, or mineral water, has no soda in it, but is made by forcing into common water carbonic acid gas, given off by the bicarbonate of sodium in solution, upon the addition of an acid to it, as sulphuric or chlorohydric acid.