Present name. - Crystallized Boric Acid. Hbo2,H1O.

This is prepared by adding any of the mineral acids to a hot saturated solution of Borax. It is deposited in crystalline scales on cooling. These, after being washed with distilled water and dried, are fused in a platinum crucible, and the mass re-dissolved in four times its weight of boiling distilled water, and re-crystallized.

Test. - A solution in alcohol burns with a green flame.

This has not been proved, but is noticed in B. J. H., vol. ii.

It is used externally in the antiseptic treatment of wounds, and as it promises to be of use in some forms of skin disease, it is very desirable that its homoeopathic action should be investigated.

Preparation. - Solution in alcohol.