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.”
Uncle George laid three saucers on the table, and continued:—
“We are going to look into the life of the caddis fly to-day; but before I take them out of the water, I want you to tell me what you have noted about them up to now.”
“They are always climbing up the water weeds,” said Frank.
“They are always adding to their cases,” said Tom.
“Some of them have died,” said Frank.
“What?” said his uncle. “Do you mean these at the bottom of the tank? These are not dead, they are only asleep. Put your hand in, and take some of these out.”