An A to Z catalog of ailments and the herbal remedies that heal them. Full of facts on the ecology and traditional uses of medicinal plants by a leading ethnobotanist who has conducted much of his research in the Upper Amazon of Peru. Each chapter begins with an anecdote of an encounter with a patient and leads to easy "how-to" instructions for treating the health condition. The chapters cover minor and serious complaints, ranging from bad breath to depression, high cholesterol to wrinkles, morning sickness to viral infections.  (AMZ40, $19.95)