This section is from the "Henley's Twentieth Century Formulas Recipes Processes" encyclopedia, by Norman W. Henley and others.
Powdered slippery elm bark....... 2 teaspoonfuls
(or the equivalent in whole bar)
Boiling water...... 1 cup
Sugar, enough. Lemon juice, enough. Pour the water upon the bark. When cool, strain and flavor with lemon juice and add sugar. This is soothing in case of inflammation of the mucous membrane.