Assertion: digitalis | /r/CapableOf | contribute to medicinal action of the leaves
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Source sentences:
text: Although digitoxin is the most active constituent of digitalis leaves the relative activity of the drug cannot be determined by the chemical estimation of this substance, since digitalin and possibly other bodies also contribute to the medicinal action of the leaves, and because purification of the glucoside alters its toxicity; nor has the proposal to effect a valuation of the leaves by determining the quantity necessary to kill a certain weight of frog within a certain time been generally accepted, although in the absence of a chemical standard this is the only method by which even an approximate estimation of physiological activity can be obtained.