“Look here, boys,” said Uncle George, “you have been paying nearly all
your attention to the larva cage during my absence, and have forgotten
the caddis worms.”
[Illustration]
1. Caddis Cases.
2. Larva out of Case.
3. Pupa.
4. Caddis Fly.
Uncle George made believe to be cross.
“We changed the water every two days,” said Frank.
“Yes, I know. But you have not reported any changes in the creatures
themselves. What has been going on in the larva cage has also been going
on here in the water, for caddis worms are simply water-caterpillars.
You nearly missed something of very great interest.”