Thomas Henry Briggs, Isabel MacKinney & Florence Vane Skeffington,  Junior High School English, Londres, Ginn & Company, 1921.

( Caddis- worms )*are among the most ingenious of the self-clothing insects. The particular species of caddis-worm. I have chosen is found in muddy-bottomed, stagnant pools crammed with small reeds. It is the little grub that carries through the still waters a bundle of tiny fragments fallen from the reeds. Its sheath a, a traveling house, is an elaborate piece of work, made of many differents materials. The young worms, the beginners, start with a sort of deep basket in wicker-work made of small, stiff roots, long steeped and peeled under water. The grub that has made a find of these fibers saws them with its jaws and cuts them into little straight sticks, which it fixes one by one to the edge of its basket, always crosswise. This pile of spikes is a fine protection but hard to steer throught the tangle of water-plants.
Sooner or later the worm forsakes it, and builds with round bits of wood, browned by the water, often as wide as a thick straw and a fingers breadth long, more or less-taking them as chance supplies them..
What is the use of these house which the caddis-worm carry about with them ? I catch a glimpse of the reason for making

page 15.

(*) The caddis-worm is the grub of caddis fly, which is like a small moth and is often seen flitting over out streams and ponds. There are about one hundred and fifty species of this fly in America.

Each beetle grabs a sheath by the middle and tries to rip it open by tearing off shells and sticks. While this is going on, the caddis-worm, close-pressed, appears at the mouth of the sheath, slips out, and quickly escapes under the eyes of the water-beetle, who appears to notice nothing.

page 160 .