This section is from the book "A Practitioner's Handbook Of Materia Medica And Therapeutics", by Thos. S. Blair. Also available from Amazon: A Practitioner's handbook of Materia Medica and Therapeutics.
Haematoxylon, Logwood. A tonic astringent used in 10 to 20 gr. doses of the extract in dysentery and relaxed intestinal conditions. It has been claimed, but it is not substantiated, that small doses of this agent relieve the sense of constriction incident to angina pectoris.