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.
A white granular powder, which when heated to redness gives a reddish-brown residue of impure oxide, soluble in boiling hydrochloric acid without effervescence. This solution gives, with sulphate of potash, a white double sulphate of potassium and cerium: the oxalate itself is insoluble in water. The soluble salts, such as the chloride and nitrate, have a sweet astringent taste: with alkalies and their carbonates they give yellowish-white precipitates.
There is some clinical evidence in favor of attributing to cerium a sedative action upon the gastric mucous membrane and upon the nervous system, and especially on reflex excitability, but I am not aware of any physiological research as to the properties of this drug.
Bismuth, silver, and cyanides.