Notwithstanding this statement of priority, the anthology is full of poems (Andrew Marvell's, for instance) that at least initially draw our attention to them because of their compelling historical subject matter; our sense of the beauty of the poem as a poem could follow secondarily. Really. Why not? The order in which these two sorts of value are ascertained does not affirm or refute the New Critical ban on historical readings, for, at least here, the interpretation of historical significance is permitted right from the start.
Here's a passage from the prefatory "Letter to the Teacher," written in 1938:
This book has been conceived on the assumption that if poetry is worth teaching at all it is worth teaching as poetry. The temptation to make a substitute for the poem as the object of study is usually overpowering. The substitutes are various, but the most common ones are:1. Paraphrase of logical and narrative content;Of course, paraphrase may be necessary as a preliminary step in the reading of a poem, and a study of the biographical and historical background may do much to clarify interpretation; but these things should be considered as means and not as ends. And though one may consider a poem as an instance of historical or ethical documentation, the poem in itself, if literature is to be studied as literature, remains finally the object for study. Moreover, even if the interest is in the poem as a historical or ethical document, there is a prior consideration: one must grasp the poem as a literary construct before it can offer any real illumination as a document.
2. Study of biographical and historical materials;
3. Inspirational and didactic interpretation.