Don't quite agree: if it is any Metro it can be every Metro
but it may well have been planted in his mind by one particular Metro, in
Paris naturally because of his title? In the universal sense it is 'every'
Metro but but but

can you expand on your comment
> The awakening described in The Tree opened Pound to the underworld of
> recurrent types.

E gad it seems a strange paring of The Tree with the Metro poem?

en passant, Eliot wrote a general comment about these shorter poems stating
that the feeling/mood is more interesting than the writing
& with an embellished dictate: "In the perfect poem both are equally
interesting, and being equally interesting are interesting as one thing and
not as two." Isn't that a flipping marvellous piece of aesthetic theorising
or whatever one might call it? Excuse lengthy email.