In one region the taste might be all for compression, for increase of the tension, for suppression of the tamer intervals in the story. In another it might run to greater length and ease, and favour a gradual explication of the plot. The "Elder Edda" shows that contamination was possible. It shows that there might be frequent independent variations on the same theme, and that, apart from any editorial work, these versions might occasionally be shuffled and jumbled by mere accidents of recollection. Thus there is nothing contrary to the evidence in the theory that a redactor of _Beowulf_ may have had before him different versions of different parts of the poem, corresponding to one another, more or less, as _Atlamál_ corresponds to the _Atlakviða_. This hypothesis, however, does not account for the difference in form between the English and the Northern poems. No handling of the _Atlamál_ or the _Atlakviða_ could produce anything like the appearance of _Beowulf_. The contaminating editor may be useful as an hypothesis in certain particular cases. But the heroic poetry got on very well without him, generally speaking. It grew by a free and natural growth into a variety of forms, through the ambitions and experiments of poets. Variety is evident in the poems that lie outside the Northern group; _Finnesburh_ is of a different order from _Waldere_. It is in the Northern collection, however, that the variety is most evident. There the independent versions of the same story are brought together, side by side. The experiments of the old school are ranged there; and the fact that experiments were made, that the old school was not satisfied with its conventions, is perhaps the most legitimate inference, and one of the most significant, to be made by a reader of the poems. Variations on similar themes are found in all popular poetry; here again the poems of the _Edda_ present themselves as akin to ballads. Here again they are distinguished from ballads by their greater degree of ambition and self-consciousness. For it will not do to dismiss the Northern poems on the Volsung story as a mere set of popular variations on common themes. The more carefully they are examined, the less will be the part assigned to chance and imperfect recollection in producing the variety of the poems. The variation, where there are different presentations of the same subject, is not produced by accident or the casual and faulty repetition of a conventional type of poem, but by a poetical ambition for new forms. _Codex Regius_ is an imperfect monument of a time of poetical energy in which old forms were displaced by new, and old subjects refashioned by successive poets. As in the Athenian or the English drama the story of Oedipus or of Lear might be taken up by one playwright after another, so in the North the Northern stories were made to pass through changes in the minds of different poets.