τὸ δὲ ὕδωρ τὸ ἐν τῇ λίμνῃ αὐθιγενὲς μὲν οὐκ ἔστἱ ἄνυδρος γὰρ δὴ δεινῶς ἐστι ἡ ταύτᾐ, ἐκ τοῦ Νείλου δὲ κατὰ διώρυχα ἐσῆκται, καὶ ἓξ μὲν μῆνας ἔσω ῥέει ἐς τὴν λίμνην, ἓξ δὲ μῆνας ἔξω ἐς τὸν Νεῖλον αὖτις·