It may be fairly presumed that natural mineral waters are natural only so far as the water is concerned, for as the spring rises, it is obvious that artificial means must be used to put the requisite amount of carbonic acid gas into them. In other words, the gas is collected in a gasometer, and the water running off from the natural springs is collected in cylinders, which are necessarily charged at a higher pressure than that of the natural source.

By "artificially prepared mineral waters" are to be understood not only imitations of certain natural mineral waters, but also other arti-ficially prepared solutions of mineral ingredients in water, which externally appear like mineral waters without being, according to their chemical composition, a natural mineral water.