“My father used to say, of car after car, this is my last LaSalle, or Cadillac, or whatever, but it never was, at least not for longer than he expected. I feel quite sure this is my last book. Unless I am hit on the head with a falling rock and vast reservoirs of hitherto unperceived material are revealed to me. As it stands I feel pretty much that I have left no stone unturned.”