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
Parable of the Olive Tree the ground and nourished it. In time some new branches appeared, but the top of the tree began to perish. So the master of the vineyard instructed his servant to cut off the decayed branches, and replace them with grafts of wild olives. Meanwhile, natural branches of the tree were transplanted to other parts of the vineyard. In time the original tree, now with wild olive branches grafted onto it, grew to give good fruit. Those natural branches of the original tree that were transplanted into poor soil also grew to give good fruit. However, a natural branch of the