He doesn't appear till Chapter 5, maybe thats it.
Marge: Have you noticed any change in Bart
Homer: New glasses?
Marge: Noooo... He looks like something maybe disturbing him
Homer: Probably misses his old glasses
Marge: We could get more involved in Bart's activities, but then I'd be afraid of smothering him
Homer: Yeah, and then we'd get the chair.
Marge: That's not what I meant!
Homer: It was Marge, admit it.