Contractions. - Guiac. Gui. Guaiacum officinale. Nat. ord., Zygophyllaceae. Synonyms. - Lignum vita), Lignum sanctum. Fig. - Flora Hom., pl. 34.

Guaiac. For. names: German, Pockenholz; French, Gaiac; Italian, Legno santo, Guaiaco; Spanish, Guayaco, Palo santo.

Habitat. - West Indies and South America.

Part employed. - The gum-resin.

Characters. - In large masses of a brownish or greenish-brown colour; fractured surface resinous, translucent at the edges. A solution in rectified spirit strikes a clear blue colour when applied to the inner surface of a raw potato-paring.

Preparation. - Tincture, using rectified spirit.

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

Proper forms for dispensing. - φ and upwards, Tincture, Pilules, or Globules.