Decoction of Althea.
Take of the roots of marsh-mallows, moderately dried, three ounces; raisins of the sun, one ounce; water, three pints. Boil the ingredients in the water till the one third of it is consumed; afterwards strain the decoction and let it stand for some time to settle. If the roots be thoroughly dried, they must be boiled till one half of the water be consumed.
In coughs, and sharp defluctions upon the lungs, this decoction may be used for ordinary drink.
William Buchan
Domestic Medicine 2nd edition 1785