A brief chapter on the medicinal properties and actions of herbs, with multiple examples of herbs in each category, is followed by a good materia medica. It only covers 160-170 herbs, and so is not the most comprehensive one available, but each entry is a very good mix of modern medical and traditional herbal details: the part(s) used, taste/smell, "tendencies" (e.g. cooling/drying), dosage, mental picture and specific indications.
There are good size sections on herbal formulae for different conditions (mentioning both appropriate adjunct therapies and any cautions that should be observed) and also on how to make different herbal preparations. There are even a few small chapters on dosages.