History of aspirin tree in 1758 and noticed an astringency reminiscent of the standard—and expensive—ague cure of Peruvian bark. He collected, dried, and powdered a substantial amount of willow bark, and over the next five years tested it on a number of people sick with fever and agues. In his letter, Stone reported consistent success, describing willow extract's effects as identical to Peruvian bark, though a little less potent. (In fact, the active ingredient of Peruvian bark was quinine, which attacked the infectious cause of malaria, while the active ingredient of willow extract, salicin, relieved the symptoms of malaria but could not cure
Scarred tree Scarred tree Scarred trees are trees which have had bark removed by indigenous Australians for the creation of bark canoes, shelters, shields and containers, such as coolamons. They are among the easiest-to-find archaeological sites in Australia. Bark was removed by making deep cuts in a tree with a stone pickaxe or other similar tool. The area of bark removed is typically regular in shape, often with parallel sides and slightly pointed or rounded ends, and the scar usually stops above ground level. Australian native Eucalypt species such as box and red gum were commonly used, and the scars remain in