This section is from the book "A Treatise On Therapeutics, And Pharmacology Or Materia Medica Vol2", by George B. Wood. Also available from Amazon: Part 1 and Part 2.
This has been fully considered elsewhere. (See page 125.) I introduce it here simply to say that, in the dose of about six grains, in persons unaccustomed to its use, it will generally vomit, and may be resorted to in urgent cases for this purpose. it is, however, so apt to produce excessive and distressing nausea, and at the same time is so uncertain in any special dose, that it is almost never employed for this purpose at present. it is poisonous in over-doses, but is said to be less dangerous, when exhibited by the stomach than by the rectum, because more apt to be discharged.
Besides the above products, the following may be used for an emetic effect, though all more or less uncertain, and most of them disposed also to act on the bowels:- The roots of different species of violet (Viola), of the daffodil (Narcissus pseudo-narcissus), of the seneka Snakeroot (Polygala Senega)-, the leaves and roots of asarabacca (Asarum Europaeum), all in the dose of from thirty grains to a drachm; and the root of our indigenous indian hemp (Apocynum cannabinum), and dog's-bane (Apocynum androsaemifolium), in the dose of twenty or thirty grains.