This section is from the book "Materia Medica And Therapeutics Inorganic Substances", by Charles D. F. Phillips. Also available from Amazon: Materia medica and therapeutics.
Under small doses of arsenic the secretions are increased, especially of those glands by which the drug is eliminated. Increase of quantity of the saliva is exceptional in acute poisoning, but occurs when absorption takes place slowly and gradually. The bile, the intestinal secretions, and, generally speaking, the urine are augmented under its use; and if there be no diuresis the perspiration is commonly stimulated, and arsenic can be detected in it (Kohler: Handbuch, p. 724). Hoffmann, Glauber, Agricola, and Pott have even recommended arsenic for a diaphoretic effect, and I have myself sometimes observed this from it.