[Sidenote: Character of Gerard’s translations.] But to return to the list of Gerard’s translations. Only three of the long list are strictly dialectical, Aristotle’s _Posterior Analytics_, the commentary of Themistius upon them, and Alfarabi on the syllogism. And only one or two of the translations listed under the heading _De phylosophya_ are pure philosophy.[245] Most of Gerard’s work is mathematical and medical, natural and occult science. He translates Ptolemy and Euclid; Archimedes, Galen and Aristotle; Autolycus and Theodosius; and such writers in Arabic as Alkindi, Alfarabi, Albucasis, Alfraganus, Messahala, Thebit, Geber, Alhazen, Isaac, Rasis, and Avicenna. His mathematical translations include the fields of algebra and perspective as well as geometry and astronomy. Of Aristotle’s natural philosophy the list includes the _Physics_, _De coelo et mundo_, _De generatione et corruptione_, _De meteoris_ except the fourth and last book which he could not find,[246] and the first part of the astrological _De causis proprietatum et elementorum_ ascribed to Aristotle. Among his translations of Galen was the apocryphal _De secretis_, of which we shall have more to say in a later chapter on books of experiments. Three treatises of alchemy are included in the list of his translations and also a geomancy, although Boncompagni tries to saddle the latter upon Gerardus de Sabloneto. Gerard is also supposed to have translated some works not mentioned in this list but ascribed to him in the manuscripts. One of interest to us is a work on stones of the Pseudo-Aristotle.[247] [Sidenote: Science and religion in the preface to a translation of the _Almagest_ from the Greek.]