The book is in lecture form, in a pleasantly personal fashion, which contains history of the plant or mineral, its use or abuse, preparation, and action on proving, and the narration gives an image about the drug to the reader even to laymen.
First 105 pages are about sources of materia medica, general principle of drug action, posology etc.
This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. It was reproduced from the original artefact, and remains as true to the original work as possible. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public.