A Remarkably Reference Source for factual information on over a score of medicinal herbs.... Covers botany, history of use, preparation of extracts, animal toxicology, human responses, and established medical values-- ALL WITH EXCELLENT REFERENCES to the published literature. A fine balance is maintained in answering the questions asked by the researcher ( what is in there and what is its action) and the herbalist (how can it be used to heal and maintain a patient).