Contractions. - Mag-s. Mg-s.
Present name. - Magnesic Sulphate. MgSo47h1o.
This is the well-known Epsom Salts, and may be obtained from the manufacturing chemists.
Characters and Tests. - In minute colourless and transparent rhombic prisms, possessing a bitter taste. It readily dissolves in water, and the solution gives copious white precipitates with Chloride of Barium, and with a mixed solution of Ammonia, Chloride of Ammonium, and Phosphate of Soda. Its aqueous solution at ordinary temperatures is not precipitated by Oxalate of Ammonia; nor should it give a brown precipitate with Chlorinated Lime or Soda. The precipitate given by Carbonate of Soda, when obtained from a boiling solution of 100 grains of the salt, should, when well washed, dried, and heated to redness, weigh 1626 grains.
Preparation. - Solution in distilled water for lx; dilute alcohol may be used for 1, and rectified spirit for all above.
Reference to Horn. Proving. - Ann. d. Horn. Klin., iv.
Proper forms for dispensing. - lx and 1, Solution only. 3x and upwards, Tincture, Pilules, or Globules.