In apparent contradiction to his statement in _Hypotyposes_ I., that Scepticism and Empiricism are opposed to each other, in that Empiricism denies the possibility of knowledge, and Scepticism makes no dogmatic statements of any kind, Sextus classes the Sceptics and Empiricists together in another instance, as regarding knowledge as impossible[6] [Greek: all oi men phasin auta me katalambanesthai, hoster hoi apo tes empeirias iatroi kai hoi apo tes skepseos phiolosophoi]. In another case, on the contrary, he contrasts the Sceptics sharply with the Empiricists in regard to the [Greek: apodeixeis].[7] [Greek: hoi de empeirikoi anairousin, hoi de skeptikoi en epoche tauten ephylaxan]. [1] _Hyp_. ii. 238. [2] _Adv. Math_. A. 260. [3] _Adv. Math_. vii. 202. [4] _Adv. Math_. A. 61. [5] Zeller _Op. cit._. iii. 43. [6] _Adv. Math._ viii. 191. [7] _Adv. Math._ VIII. 328. Pappenheim thinks that Sextus belonged to the Methodical School, both from his strong expression in favor of that school in _Hyp_. I. 236, as above, and also because many of his medical opinions, as found in his works, agree with the teachings of the Methodical School, more nearly than with those of the Empiricists. Pappenheim also claims that we find no inconsistency with this view in the passage given where Sextus classes the Sceptics with the Empiricists, but considers that statement an instance of carelessness in expressing himself, on the part of Sextus.[1] [1] _Lebensverhaeltnisse des Sex. Em._ 36.