Origen’s most important contribution to biblical literature was his elaborate attempt to rectify the text of the Septuagint by collating it with the Hebrew original and other Greek versions. On this he spent twenty-eight years, during which he travelled through the East collecting materials. The form in which he first issued the result of his labours was that of the Tetrapla, which presented in four columns the texts of the LXX., Aquila, Symmachus, and Theodotion. He next issued the Hexapla, in which the Hebrew text was given, first in Hebrew and then in Greek letters. Of some books he gave two additional Greek versions, whence the title Octapla; and there was even a seventh Greek version added for some books. Unhappily this great work, which extended to nearly fifty volumes, was never transcribed, and so perished (Kitto, Cycl.).