The inner bark of the white walnut tree has an important place in the Materia Medica. Its principal use is as a physic, and in that respect it is exceedingly valuable on account of its mild action and the tonic impression left upon the structures of the bowels. Its chief influence is exerted upon the lower bowels, and for that reason it cannot be excelled for prolapsus and constipation due to a sluggish condition of the large bowels. It is best administered in the form of syrup made by slowly boiling a pound of the bark in water and evaporating to one pint and adding two pounds of sugar; dose, a teaspoonful. Butternut syrup is a valuable physic for use in protracted febrile diseases.