Down, down, down.  Would the fall NEVER come to an end!  `I wonder how many miles I've fallen by this time?' she said aloud. `I must be getting somewhere near the centre of the earth.  Let me see:  that would be four thousand miles down, I think--' (for, you see, Alice had learnt several things of this sort in her lessons in the schoolroom, and though this was not a VERY good opportunity for showing off her knowledge, as there was no one to listen to her, still it was good practice to say it over) `--yes, that's about the right distance--but then I wonder what Latitude or Longitude I've got to?'  (Alice had no idea what Latitude was, or Longitude either, but thought they were nice grand words to say.)