Merck & Co., Merck's 1899 Manual of the Materia Medica
“ When stomach is at all irritable the carbonate is often best. Weak, anemic girls with vomiting after food are best treated with the perchloride. In coated tongue the ammonio-citrate is often best to begin with. The malate has been useful in pernicious anemia. In gastric disturbance and constipation, a combination with rhubarb is often very effectual. Where mucous membrane is very flabby, large doses of the perchloride. Chalybeate waters more often succeed than pharmaceutical preparations; one drop of the solution of perchloride in a tumbler of water is an approximate substitute for them. ”
