Aspirin was developed in the 1800’s from the constituent salicin, found in the bark of white willow. Aspirin works more quickly than white willow, but white willow’s effects are believed to last longer. All willow trees have similar properties as aspirin due to the presence of this constituent. Ancient texts from Assyria, Sumer and Egypt mention willow bark as a remedy for aches and fever. The Pomo Indians of California boiled the inner bark and drank the resulting tea to promote sweating in cases of chills and fever.