Vitruvius, of course, made no philological or archaeological study of the two adjectives but explained them in terms of the theater which was known to him (see pp. 76 f., above). It should be noted, however, that Vitruvius mentions only the tragic and comic actors under the term _scaenici_ and includes under _thymelici_ “the other artists” who perform in the orchestra. Does the dramatic chorus belong among the latter? Or is it simply ignored here? The answer is far from certain. If we were dealing only with new plays, it is conceivable that the choruses were so detached from the histrionic action as to be able to stand ten or twelve feet below the actors. But it is well known that some of the fifth-century tragedies were still popular and frequently acted; and as we have already seen, they were not amenable to any such method of staging. In revivals of early masterpieces, then, did all the performers, actors and chorus alike, appear in the orchestra, as in the old Greek theaters? Or was the chorus so reduced in size, and its manner of performance so altered, that it could stand with the actors on the high and narrow Graeco-Roman stage, as they all certainly did on the low and broad Roman stage? It is impossible to determine. All that can truthfully be said is that Vitruvius does not clearly indicate the place of the dramatic chorus in the Graeco-Roman theater. My own opinion is that he is speaking of two distinct types of performance and is ignoring the dramatic chorus. The same question arises in connection with Pollux. He catalogues eleven parts of a theater. Of these, only six concern us at present: σκηνή, orchestra, logium, proscenium, parascenia, and hyposcenium (IV, 123). Dörpfeld thinks that Pollux is describing the Greek Hellenistic theater,[197] but Pollux was for many years a professor at Athens and dedicated his work to the emperor Commodus (161-92 A.D.). Unless his language prevents it, it is more natural to suppose that he had the Athenian structure of his own day in mind, and this would be the Nero theater. In that case, every term falls into place. For the Nero theater logium could refer to the stage alone; and as there would be no sense in Pollux mentioning two words for stage, and since no other term for scene-building as a whole (including logium, proscenium, and parascenia) appears in his list, σκηνή must still mean scene-building and not stage. Pollux then proceeds to say that “the scene-building belongs to the actors and the orchestra to the chorus,” and a little later that “entering at the orchestra they mount to the scene-building on ladders (steps?).”[198] Believing that Pollux is describing the Hellenistic theater, Dörpfeld interprets the first of these passages much as Aristotle’s use of ἐπὶ (ἀπὸ) τῆς σκηνῆς has just been explained. The second passage he considers a reference to some such unusual incident as occurs in Aristophanes’ _Clouds_, where an actor is bidden to climb