Contractions. - Natr-s. Na-s.

Present name. - Sodic Sulphate. Na2So4,10H1O.

Glauber Salts, prepared by solution in distilled water and re-crystallization.

Characters and Tests. - In transparent oblique prisms; has a salt and bitter taste; effloresces on exposure to the air; soluble in water, insoluble in spirit. Exposed to heat in a porcelain crucible, it loses 55.9 per cent. of water. Heated with solution of Potash, no odour of Ammonia is evolved, and no precipitate is formed. Imparts a yellow colour to .flame. 50 grains of it dissolved in distilled water and acidulated with Hydrochloric Acid, give by the addition of Chloride of Barium a white precipitate, which, when it has been washed and dried, weighs 72.2 grains.

Preparations. - Trituration. Solution in distilled water for 1x, dilute alcohol for 1, 20 O.P. spirit for3x, and rectified spirit for all above.

Reference to Horn. Proving. - Annalen, iii.

Proper forms for dispensing. - lx to 3, Trituration. lx and 1, Solution. 3x and upwards, Tincture, Pilules, or Globules.