ὣς ὁ μὲν ἔνθ' ἀπόλωλεν, ἐπεὶ πίεν ἁλμυρὸν ὕδωρ → so there he perished, when he had drunk the salt water
v. εἴσειμι.
εἰσῄειν: impf. к εἴσειμι.
