Johann Gottfried Eichhorn in his introduction to the Old Testament (1780–1783) took up and developed Astruc’s approach. He pointed to further stylistic distinctions between the two sources (or “strands”) in Genesis, the “Yahwistic” and the “Elohistic” (subsequently dubbed “J,” from the German spelling Jahve, and “E,” respectively). A further refinement to the theory was made by Karl David Ilgen, who in 1798 anticipated later critical study by arguing that there are in fact not one but two distinct