According to James, how would the glow worm be if great use to the people?

The glowworm would be of great use because people wouldn't need electricity.

This charming Glowworm, lover of simplicity. She is easy to install On your ceiling or your wall, And although this smacks a bit of eccentricity, It’s really rather clever For there after you will never You will NEVER NEVER NEVER Have the slightest need for using electricity.’