Yesterday, Julia spontaneously decided yesterday to try the potty chair - twice! - and even went once. We're hoping (but not believing) that this might stick. We've been trying on and off to remind Julia about the party that we will have when she's in underwear and not having accidents, so yesterday as she was trying to go, I said, "And when you're all potty trained, you get to have a..." She looked at me blankly, so I went, "P-p-p-p-p..." and she blurted out happily, "Preschool!" So her mind's in the right place.
(Coda Since I've been sitting on a related anecdote for a while without figuring out a good way to use it, I might as well simply include it here. Often when I ask Julia about what she expects to do in preschool, she will list a few items such as "toys" and "reading books," and then add "playing math!" I'm glad she already has this attitude towards it.)