This section is from the book "Materia Medica Pharmacy, Pharmacology And Therapeutics", by W. Hale White. Also available from Amazon: Materia Medica Pharmacy, Pharmacology And Therapeutics..
(Not official.) The Sulphate of the alkaloid Duboisine obtained from the leaves of Duboisia myoporoides, nat. ord. Solanaceae. Duboisine is probably identical with Hyoscyamine (see p. 384).
The action of duboisine is like that of atropine, and ophthalmic discs containing 1/5000 of a grain .000013 gm. are used to dilate the pupil.