idea of migration is still less trustworthy. Certainly not every journey recorded in Genesis (e.g. that of Joseph from Hebron to Shechem and Dothan, 3714ff.: pace Steuernagel) can be explained as a migratory movement. Even when the ethnological background is apparent, the movements of tribes may be necessary corollaries of the assumed relationships between them (e.g. Jacob's journey to Ḥarran: p. 357); and it will be difficult to draw the line between these and real migrations. The case of Abraham is no doubt a strong one; for if his figure has any ethnological significance at all, his exodus from Ḥarran (or Ur) can hardly be interpreted otherwise than as a migration of Hebrew tribes from that region. We cannot feel the same certainty with regard to Joseph's being carried down to Egypt; it seems to us altogether doubtful if this be rightly understood as an enforced movement of the tribe of Joseph to Egypt in advance of the rest (see p. 441).
But it is when we pass from genealogies and marriages and journeys to pictorial narrative that the breakdown of the ethnological method becomes complete. The obvious truth is that no tribal relationship can supply an adequate motive for the wealth of detail that meets us in the richly coloured patriarchal legends; and the theory stultifies itself by assigning ethnological significance to incidents which originally had no such meaning. It will have been noticed that Cornill utilises a few biographical touches to fill in his scheme (the youthful ambition of Joseph; his sale into Egypt, etc.), and every other theorist does the same. Each writer selects those incidents which fit into his own system, and neglects those which would embarass it. Each system has some plausible and attractive features; but each, to avoid absurdity, has to exercise a judicious restraint on the consistent extension of its principles. The consequence is endless
into historical terms. There is probably not one of them which is capable of rigorous and universal application. Thus, the marriage of Jacob to Leah and Rachel does not necessarily imply that Jacob was a tribe which successively absorbed the two clans so named: it is just as likely that the union of Leah and Rachel with one another produced the entity Jacob.
