Francis Day Curtis & Otis William Caldwell & Nina Henry Sherman, Biology for Today, Boston, Ginn and Co, 1934, p. 661.
Caddis-fly larvae may be collected in almost any pond or stream where the current is not too swift. Look for them on the bottom, crawling about or clinging to weeds and sticks. Those which live on sandy bottoms have houses built of pebbles (Fig. 431).
Other kinds make their homes of bits of sticks or weed stalks cemented together. Gently remove a larva from its case and place it in a dish where there are bits of material from which it can makes another home. Then watch it at work. If, instead of the tiny bits of sand or seeds stems, you put fine pieces of mica into the water, the caddis worm may use these to make its house. You will then be able to observe the living worm through this transparent case.