It is certainly to be reckoned not so very far below London, which, with Mr. Henry James, Mr. Harry Harland, and Mr. Bret Harte, seems to me an American literary centre worthy to be named with contemporary Boston. Which is our chief literary centre, however, I am not, after all, ready to say. When I remember Mr. G. W. Cable, at Northampton, Massachusetts, I am shaken in all my preoccupations; when I think of Mark Twain, it seems to me that our greatest literary centre is just now at Riverdale- on-the-Hudson.