THE author has examined the wells and springs of Bern and Magdeburg, with the view of determining their sanitary value as drinking waters. In these waters the quantities of sulphuric acid and chlorine are together always slightly more than sufficient to neutralise the potassium and sodium, so that the quantity of the latter can be estimated by determining that of the former constituents. He considers that the sulphuric acid is present as alkali-sulphate, and not any as gypsum ; for, as

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... carbonate is disseminated through the soil, and as gypsum in solution reacts with magnesium carbonate, it would, if present in the water, cause a certain relation to exist between the dissolved mag-206-214).