The guide actually doing very well named; it is easy to visit, either by searching for a pathology, or by consulting the listings of 12 favorite essential oils of the author; these cards are very clear and relatively detailed; at the end of the book there is an index of the most common pathologies with essential oils that correspond to them; this guide is a good base for who does not want to ruin in purchasing from multiple species; the most common diseases can be treated with oils described in this book but it is also interesting to my mind to cross this work with others to discover other species whose action will be targeted to meet a particular pathology.