The books of Sextus Empiricus furnish us with the best and fullest presentation of ancient Scepticism which has been preserved to modern times, and give Sextus the position of one of the greatest men of the Sceptical School. His works which are still extant are the _Pyrrhonean Hypotyposes_ in three volumes, and the two works comprising eleven books which have been united in later times under the title of [Greek: pros mathematikous], one of which is directed against the sciences in general, and the other against the dogmatic philosophers. The six books composing the first of these are written respectively against grammarians, rhetoricians, geometricians, arithmeticians, astronomers and musicians. The five books of the latter consist of two against the logicians, two against physics, and one against systems of morals. If the last short work of the first book directed against the arithmeticians is combined with the one preceding against the geometricians, as it well could be, the two works together would be divided into ten different parts; there is evidence to show that in ancient times such a division was made.[1] There were two other works of Sextus which are now lost, the medical work before referred to, and a book entitled [Greek: peri psuches]. The character of the extant works of Sextus is similar, as they are all directed either against science or against the dogmatics, and they all present the negative side of Pyrrhonism. The vast array of arguments comprising the subject-matter, often repeated in the same and different forms, are evidently taken largely from the Sceptical works which Sextus had resource to, and are, in fact, a summing up of all the wisdom of the Sceptical School. The style of these books is fluent, and the Greek reminds one of Plutarch and Thucydides, and although Sextus does not claim originality, but presents in all cases the arguments of the Sceptic, yet the illustrations and the form in which the arguments are presented, often bear the marks of his own thought, and are characterized here and there by a wealth of humor that has not been sufficiently noticed in the critical works on Sextus. Of all the authors who have reviewed Sextus, Brochard is the only one who seems to have understood and appreciated his humorous side. We shall now proceed to the consideration of the general position and aim of Pyrrhonism. [1] Diog. IX. 12, 116. CHAPTER II. _The Position and Aim of Pyrrhonism_.