Much to Lum's annoyance, Abner and Grandpappy continue to experiment with the Junior Misto Chemistry set that Grandpappy bought from a family who had joined the current migration from Pine Ridge to Big Fork. While Lum is trying to find a way to stem this tide of migration, Abner and Grandpappy are trying to make invisible ink. As we look in on the little community today, we find these two old chemists back in the feed room of the store and library, hard at work...