The Length of the Letters

This may be a rather surface-level thought, but when reading for class on Tuesday, I couldn’t help but notice that as we get further into the letter collection and therefore further in time, Dickinson’s letters get noticeably shorter. Not only that, but they also include more phrases and writing that feel reminiscent of poetry rather than prose. This could just be a consequence of Dickinson just getting more involved in her own poetry, so she has less time to write letters, as well as causing poetic writing to become more prominent in her letters. However, I do wonder if there is some other reason for this; is it possible that it is more of a conscious choice that Dickinson made?