You would need to activate it fully and if you want to remember the poetry in it you will be able to remember it faster by photoreading it first.
As such why would you want to memorise a whole book? Books generally represent "a" persons thoughts or ideas, since when is someone elses thoughts or ideas more important than your own that you would want to memorise their book verbatium? Just because they wrote it in a book and the book was published doesn't mean that the ideas represented in a book are fact.
School science books from 1920s contained a lot of misleading imformation that scientist of today dare not acknowledge in there current projects. Fortunately the preceding generation of scientist didn't just memorise the book, they used the ideas contained in them as starting points for their own explorations.
Alex