Any doubt that might have existed as to the identification of the ὑδρία is solved by the appearance of the word inscribed over the pitcher which Polyxena dropped in her flight from Achilles, on the François vase. In a scene very common on B.F. hydriae, which represents women drawing water at a fountain, this form of vase is invariably depicted. The word seldom occurs in Greek literature, but Kallimachos speaks of καλπίδες placed on the roof of the Parthenon (?) at Athens, not, he says, by way of ornament, but as prizes of wrestlers.[561] Hence the idea was conceived by Panofka that Panathenaic prize-vases were of this form. [Illustration: FIG. 35. KALPIS.] Pollux (x. 74) thinks that the hydria was also a wine-vase, and suggests its identity with the πλημοχόη, a vase with broad base used in the Mysteries; but Athenaeus[562] implies that this was used for pouring, and it must therefore have been some kind of jug. The κάλπις is actually identified with the ὑδρία by Aristophanes, as may be seen by a comparison of two lines in the _Lysistrata_.[563] From a passage in Isocrates[564] it would appear that the hydria was used as a voting-urn or ballot-box, but the κάδος was more generally used for this purpose. That the amphora was also so used we know from Athenian coins. The next class to be considered is that of vases employed for mixing wine and water for drinking, for which the generic name is that of κρατήρ (from κεράννυμι, “I mix”). Before discussing this form, however, allusion must be made to a vessel which is variously described as a _hydria_ or a _krater_, and is therefore a link between the two varieties; it was at any rate pre-eminently a water-jar, and was known as a κρωσσός (connected with Fr. _cruche_ = Eng. “crock”). We have no indications of its form except that it had two handles[565]; Pollux (viii. 66) ranks it with the ὑδρία and κάλπις as a water-vessel.[566] It was also used for holding ashes,[567] and Plutarch enumerates it among the vessels in the bath of Darius.[568] Of the same character was perhaps the ἀρδάνιον or ἀρδάλιον, described as a water-pot.[569] Athenaeus also mentions a πρόαρον, or wooden vessel of the krater type, as used in Attica.[570]