These formulae are for mineral waters not found in nature. They are prepared especially for medicinal purposes. Compounds of iron, sulphur, and many other medicinal sub-stances are occasionally administered in the form of artificially carbonated waters. A few such compounds we append here :

1. Dr. Meyer's Carbonated Bitter Water.

Sodium carbonate...............

3564 grains.

Magnesium sulphate..............

6888 "

Distilled water..................

10 gallons

Carbonic acid.............

45 pounds

or,

Sodium carbonate ............

9612 grains

Magnesium sulphate..............

14104 "

Distilled water............

10 gallons

Carbonic acid.............

45 pounds.

2. Carbonated Ammonia Water.

Ammonium carbonate..............

640.0 grains

Distilled water.............

10 gallons.

Carbonic acid............

45 pounds.

or,

Ammonium carbonate..............

800.0 grains.

Distilled water............

10 gallons

Carbonic acid...............

45 pounds

3. Carbonic Acid Water. (Carbonated water - Eau gazeuse - Aqua carbonata.) This is distilled or filtered water charged with 60 pounds of carbonic acid gas,

4. Carbonated Chalybeate Water.

Iron sulphate.................

96.0 grains.

Sodium carbonate.............

99.4 "

Distilled water.................

10 gallons.

Carbonic acid...................

50 pounds.

5. Aqua Ferri Jodati.

Potassium iodide...............

88.0 grains.

Iron sulphate...............

72.0 "

Distilled water..............

10 gallons.

Carbonic acid............................

45 pounds.

6. Aqua Ferri Pyrophosphorici of Doctor de Nega.

Iron pyrophosphate of peroxide............

187.0 grains

Sodium pyrophosphate.............

580.0 "

Sodium chloride.................

187.0 "

Distilled water................

10 gallons.

Carbonic acid..............

45 pounds.

or,

Iron pyrophosphate of peroxide..............

400.0 grains

Sodium pyrophosphate...........

1600.0 "

Sodium chloride............

240.0 "

Distilled water..............

10 gallons

Carbonic acid..........

45 pounds

In case other than distilled water should be used, it must be absolutely free of lime.

7. Carbonated Magnesia Water.

Magnesium carbonate, hydr...............

1053.0 grains.

Distilled water................

10 gallons.

Carbonic acid.................

50 pounds.

8. Carbonated Lithia Water.

Lithium carbonate..................

128.0 grains.

Distilled water.....................

10 gallons.

Carbonic acid................

50 pounds.

9. Tonic Water - (Carbonated Quinine Water).

Quinine sulphate....................

80 grains.

Distilled water................

10 gallons.

Carbonic acid..................

100 pounds.

Dissolve the quinine in two ounces of alcohol or in two ounces of boiling water and add to the fountain and charge. The proportion of quinine is half a grain to the half-pint bottle.

10. Carrara Water. This means a carbonated water in which finely divided Carrara marble is dissolved. Prepare it as follows:

Take chloride of calcium.............4 ounces.

Dissolve and add to the fountain.

Then add, bicarbonate of soda.........6 "

Charge, when the precipitated carbonate of lime will slowly dissolve, as it is only soluble in carbonated water. If prepared in a slate-tank the precipitated lime remains insoluble at the bottom. To avoid this it is best to put a fraction of both salt solutions in every bottle before bottling, then charge. The presence of salt in solution, which will be formed by the mixture also, is not objectionable.