Books | guardian.co.uk: "Critic and friend of both Plath and Hughes Al Alvarez ponders the rather 'uncooked' poem published for the first time last week"
The John Donne poem referred to in the article: A NOCTURNAL UPON ST. LUCY'S DAY, BEING THE SHORTEST DAY. It is a long poem, here are four lines from it:
Study me then, you who shall lovers be
At the next world, that is, at the next spring ;
For I am every dead thing,
In whom Love wrought new alchemy.