The Ninth Science: The art of casting metals for the manufacture of cannons and weapons. And the art of papermaking. Alchemy, by which is meant the knowledge of analyzing and composing parts. Many matters fall under this, such as the manufacture of gunpowder and sugar. Alchemy does not mean the philosopher's stone, as some people think, for the Franks do not know this nor do they believe in it at all. The Eleventh Muslim: The art of medicine and its branches: the art of anatomy, surgery, and health management. And the art of knowing the patient's temperament. And the art of veterinary medicine, i.e., treating horses and others. The Twelfth Science: The science of agriculture and its branches: knowing the types of crops and managing apiaries by building, etc. And knowing the specialized tools for plowing that manage irrigation. The Thirteenth Science: The science of the history of natural sciences and its branches: the classification of plants and the classification of minerals. The Fourteenth Science: The art of engraving and its branches: the art of printing and the art of engraving stones and the like. The Fifteenth Science: The art of translation, meaning the translation of books, which is one of the healthy arts, especially the translation of scientific books, as it requires knowledge of the terminology of the principles of the sciences to be translated. When you look at the reality, you see that all these sciences are known completely to these Franks, and are deficient or completely unknown to us. And whoever is ignorant of something is inferior to one who has mastered that thing. And the more a person grows older without learning something, the more he dies with regret. Praise be to God, who has decreed and favored us, saving us from the darkness of ignorance of these things that exist with others. I think that whoever has sound taste and a straight disposition will say that I will mention some of them briefly at the end of the book, God Almighty willing, and He is the one sought for help.