The same lack of unity pervades the external story. The first Book begins abruptly, in the middle; and for clearness' sake Spenser had been obliged to explain in his prefatory letter that the real commencement must be supposed to be a scene like those of Arthurian romance, at the court and annual feast of the Fairy Queen, where twelve adventures had been assigned to as many knights. Spenser strangely planned to narrate this beginning of the whole in his final Book, but even if it had been properly placed at the outset it would have served only as a loose enveloping action for a series of stories essentially as distinct as those in Malory. More serious, perhaps, is the lack of unity within the single books. Spenser's genius was never for strongly condensed narrative, and following his Italian originals, though with less firmness, he wove his story as a tangled web of intermingled adventures, with almost endless elaboration and digression. Incident after incident is broken off and later resumed and episode after episode is introduced, until the reader almost abandons any effort to trace the main design. A part of the confusion is due to the mechanical plan. Each Book consists of twelve cantos (of from forty to ninety stanzas each) and oftentimes Spenser has difficulty in filling out the scheme. No one, certainly, can regret that he actually completed only a quarter of his projected work. In the six existing Books he has given almost exhaustive expression to a richly creative imagination, and additional prolongation would have done little but to repeat. Still further, the characteristic Renaissance lack of certainty as to the proper materials for poetry is sometimes responsible for a rudely inharmonious element in the otherwise delightful romantic atmosphere. For a single illustration, the description of the House of Alma in Book II, Canto Nine, is a tediously literal medieval allegory of the Soul and Body; and occasional realistic details here and there in the poem at large are merely repellent to more modern taste.