Contractions. - Calc-a. Ca-a.

Present name. - Calcic Acetate. Ca2C2H3O2.

Impure Acetate of Lime.

The substance used by Hahnemann in his proving was an impure Acetate prepared in the following manner: -

Boil oyster-shells for an hour in water, brush off any adhering foreign matter, dry, then, having bruised, dissolve them in dilute Acetic Acid (B.P.) by heating up to the boiling-point and continuing the process till the acid is saturated, then filter and reduce to one-fifth by evaporation. The solution is deep yellow, and, after a time, precipitates a quantity of brownish mucilage. After this precipitation has taken place, mix with an equal bulk of proof spirit and again filter.

Preparation. - The above, if carefully prepared, will contain about 10 per cent. of Acetate of Lime, and hence may be considered lx. Proof spirit should be used for the 1 attenuation, 20 O.P. for 3X, and rectified spirit for 2 and upwards.

Reference to Horn. Proving. - Chr. Kr., iii.

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