The position of Pappenheim is assailable for the reason that in dealing with any problem regarding an author on the basis of internal evidence, we have no right to consider one of his statements worthy of weight, and another one unworthy, on the supposition that he expressed himself carelessly in the second instance. Rather must we attempt to find his true standpoint by fairly meeting all the difficulties offered in apparently conflicting passages. This has been attempted by Zeller, Brochard, Natorp and others, with the general result that all things considered they think without doubt that Sextus belonged to the Empirical School.[1] His other references are too strong to allow his fidelity to it to be doubted. He is called one of the leaders of Empiricism by Pseudo-Galen, and his only medical work bore the title [Greek: empeirika hupomnemata.] The opinion of the writers above referred to is that the passage which we have quoted from the _Hypotyposes_ does not necessarily mean that Sextus was not an Empiricist, but as he was more of a Sceptic than a physician, he gave preference to those doctrines that were most consistent with Scepticism, and accordingly claimed that it was not absolutely necessary that a Sceptic physician should be an Empiricist. Natorp considers that the different standpoint from which Sextus judges the Empirical and Methodical Schools in his different works is accounted for on the supposition that he was an Empiricist, but disagreed with that school on the one point only.[2] Natorp points out that Sextus does not speak more favourably of the medical stand of the Methodical School, but only compares the way in which both schools regarded the question of the possibility of knowledge, and thinks that Sextus could have been an Empiricist as a physician notwithstanding his condemnation of the attitude of the Empirical School in relation to the theory of knowledge. This difference between the two schools was a small one, and on a subtle and unimportant point; in fact, a difference in philosophical theory, and not in medical practice. [1] Brochard _Op. cit. Livre_ IV. 317; Zeller _Op. cit_. III. 15; Natorp _Op. cit._ p. 155. [2] Natorp _Op. cit_. 157.