Contractions. - Calc-p. C-ph.

Present name. - Calcic Phosphate. Ca3P2O8.

The preparation used in the proving was made by precipitation from lime-water, by adding Phosphoric Acid, drop by drop, so as to avoid re-dissolving the precipitate, and forming the superphosphate. The following is, however, a more practical method of preparing it: -

Take of

Chloride of Calcium .

3 ounces;

Phosphate of Soda . . . .

21/2 ounces;

Stronger Solution of Ammonia .

6 fluid drachms;

Distilled Water....

A sufficiency.

Dissolve the Chloride of Calcium in 10 fluid ounces of distilled water, filter and to this add the Ammonia and the Phosphate of Soda previously dissolved in 1 1/2 pint of distilled water and filtered. Collect the precipitate on a calico filter, and wash it with hot distilled water until the filtrate gives no precipitate with Oxalate of Ammonia. Finally dry on a water-bath.

Preparation. - Trituration.

Reference to Horn. Proving. - N. Arch., iii.

Proper forms for dispensing. - lx to 3, Trituration only. 4, dilute Tincture only. 5 and upwards, Tincture, Pilules, or Globules.