You may be able to observe

Alice G. MacCloskey, « Water-Folk, Chautauqua Junior Naturalist Clubs », The Chautauquan, juin 1902, pp. 287-288.

Among other things you may draw out a compact little bundle of sticks or stones, the home of a caddis-worm (Figs. 6,7). The floatting house is sometimes made of fine sand, straw, moss, or leaves. The little inmate will lie so quietly that you will not think he is there. If you take the small bundle home however, and put it in your aquarium, a tiny head will soon be thrust out in search of food. Then you will enjoy watching the caddis-worm move about, carrying its house along. There is not space in this leaflet to tell you many of the interesting things that can be learned by watching the caddis-worm, but if you have a few specimens in your aquarium you may be able to observe :

(a) That if the young caddies is taken out of its house and material is at hand, it will build another.

(b)  It lies in a tube of silk which it has spun.

(c)   When the larva is ready to go into the pupa state it makes a door over the opening of its house. The door keeps ennemies out, but is so made that it admits water which carries air for the insect to breathe.