Logwood. The Heart Wood sliced. Nat. Ord. Cesalpineae. Linn. Syst. Decan-dria Monogynia. Hab. Campeachy, Central America, and West Indies. Imported from Campeachy, from Honduras, and Jamaica.

Med. Prop. and Action. The wood (ff.) is astringent and tonic. It contains a crystalli ne substance, Hamatoxyline (C32H14O12 + 2 HO or 6 HO) (Garrod); also Tannin, and a resin. When given internally, it becomes absorbed into the system. The colouring principle has been detected in the urine twenty-five minutes after it has been swallowed. "The urine of patients taking Logwood exhibits a pink colour when that fluid becomes alkaline from any cause; in stronglyacid urine the colour may not be seen, but the addition of Ammonia readily produces the coloration."

Offic. Prep. 1. Decoctum Haematoxyli (Logwood in chips oz. j.; Powdered Cinnamon grs. lx.; Distilled Water Oj. Boil the Logwood in the water for ten minutes, add the Cinnamon towards the end, and strain fl. oz. xvj.). Dose, fl. oz. j. - fl. oz. ij.

2. Extractum Hasmatoxyli (Logwood In Fine Chips Lb

j.; Boiling Distilled Water Cj. Prepared by maceration and evaporation). Dose, gr. x. - gr. xxx.

1342. Therapeutic Uses

In Chronic Diarrha, the decoction or the extract of Logwood (the latter in doses of gr. x. - gr. xxx.) is productive of evident benefit. It not only acts as an astringent, but gives a tone to the digestive organs, and to the system generally. I have frequently seen great improvement follow its use, not only in these cases, but in that form of Dysentery where the dejections have been copious, of a mucous character, with little admixture of blood; or when the vital powers have been greatly depressed. It is inadmissible as long as active inflammation exists. In the Diarrha of Infants, the Infusion, in doses of fjss. - fjj., frequently repeated, is advised by Dr. Marshall Hall

* Monthly Journ. of Med. Science, 1852, p. 465, from which most of this article has been extracted.

Garrod, Essentials of Mat. Med. and Therap., p. 190.

Underwood on Diseases of Children, 9th Ed., p. 199.

1343. In Leucorrha, the decoction of Logwood, given internally, and used as a vaginal injection, is occasionally of great service. Dr. Churchill * speaks favourably of it; in two or three cases in which he employed it, the discharge diminished, and the patients recovered. Previous to its use, he advises a blister over the sacrum.

1344. In Cancer, The Extract Has Been Advantageously Employed By M

Desmartis: he found an ointment of it (Ext. Ha?m., Adipis aa ss.) destroys the offensive odour, and diminishes the suppuration so long as it continued to be employed. In Hospital Gangrene, he found the same ointment act like a charm; and it also proved valuable in Traumatic Erysipelas of a severe character. It may be advantageously combined with the Perchloride of Iron and other styptics.