ALL THE EXTANT WORKS. This present English edition of Sextus Empiricus by R. G. Bury contains all of his extant works as well as Diognees Laertius's chapter on Pyrrho. It is introduced, annotated, has a bibliography, a figure and an Index of Names. The writings of Sextus contain not only an exposition of Scepticism but also a critique of the doctrines of "the Dogmatists" The main task of the Sceptic is, in fact, to expose the folly of every form of positive doctrine; and consequently the bulk of these works of Sextus is controversial. Scattered through his pages there are references to almost every known name in the history of ancient Greek thought, and without some previous acquaintance with the main outlines of that history it is hardly possible to appreciate the points or estimate the value of his arguments. Accordingly, given here, for the convenience of the reader, is a short summary of the history of Greek philosophy.