John Bastyr, ND, learned first learned herbalism from his mother, who followed the Kneipp system of herbalism and nature cure. He was eventually licensed as a physician, began practicing medicine in the 1930s, and continued in practice for almost 60 years. For 35 years, he lectured on medical herbalism among other topics to physicians-in training, first at National College of Naturopathic Medicine, and later at Bastyr University, which was named after him. (Note: He had no role in the founding or administration of Bastyr University). By the 1970s, he was possibly the most clinically experienced medical herbalist in North America. His student from that time, William Mitchell, N.D., after practicing twenty-five years himself, confirming and expanding on Bastyr's observations and experience, has offered this textbook of materia medica. Mitchell also draws on the clinical observations of naturopathic colleagues in his own generation. The book reflects without a doubt more accumulated clinical experience than any similar book in print in North America today. Bastyr's methods of herbalism reflect roots in the Eclectic medical tradition, but they are clearly expanded and developed through his decades of experience and teaching. While his observations make up the foundation of the book, most of the work is actually Mitchell's, and Bastyr's teachings are "spun" somewhat with the addition of some constituent-science. The title is thus misleading, but for the advanced student or professional practitioners, Bastyr's clinical pearls, proven and passed on by Mitchell, are treasures.