The heart-wood of Haematoxylum campechianum.

Imported from Campeachy, Honduras, and Jamaica.

Characters. - The logs are heavy, hard, purplish-black externally, reddish-brown internally. The chips (which are the officinal form) are reddish-brown, and have often a greenish lustre; they have a feeble, agreeable odour and sweetish taste; a small portion chewed imparts to the saliva a dark pink colour.

Composition. - The colouring principle of logwood is a crystalline substance, haematoxylin. It is soluble in hot water or in alcohol. Logwood also contains tannic acid, which imparts to it its astringent properties.

Preparations.

B.P.

Dose.

Decoctum Haematoxyli (1 in 20).....................

1-2 fl. oz.

Extractum ,, ...........................

10 30 gr.

U.S.P.

Extractum Haematoxyli.....................

10-30 gr. (0.65-1.95 gm.)