εἰς τετρημένον πίθον ἀντλεῖν → run water into a punctured pitcher, to the perforated jar bale water, labour in vain, labor in vain
president of the Assembly: P. ἐπιστάτης, ὁ.
generally: P. πρόεδρος, ὁ, P. and V. προστάτης, ὁ.