Rush was a leading proponent of heroic medicine. He firmly believed in such practices as bloodletting patients (a practice now known to be generally harmful, but at the time common practice), as well as purges using calomel and other toxic substances. In his report on the Philadelphia yellow fever epidemic of 1793, Rush wrote: "I have found bleeding to be useful, not only in cases where the pulse was full and quick but where it was slow and tense. I have bled twice in many and in one acute case four times, with the happiest effect. I consider intrepidity in the use of the lancet, at present, to be necessary, as it is in the use of mercury and jalap, in this insidious and ferocious disease." During that epidemic, Rush gained acclaim for remaining in town and treating sometimes 100 patients per day (some through free black volunteers coordinated by Richard Allen), but many died. Even Rush acknowledged the failure of two treatments, sweats in vinegar-wrapped blankets accompanied by mercury rubs, and cold baths.