Active Ingredients. - Elm bark contains about three per cent. of tannin, and a peculiar mucilaginous and gummy principle, not met with elsewhere, called ulmine. Ulmine is dark brown, insoluble in cold water, slightly soluble in boiling water, very soluble in alkaline solutions. Richter classes elm bark with the mucilaginous astringents.

Physiological Action. - Elm bark is demulcent and diuretic. Being slightly astringent, it is also in some degree tonic.

Therapeutic Action. - Decoction of elm bark has been recommended in cases of cutaneous eruption, such as psoriasis, perhaps as a cheap substitute for sarsaparilla.

Preparations and Dose. - Mucilago Ulmi, ad libitum; Pulvis

Ulmi, in poultice.