Paul S. Weich, « The insect Life of Pond and Stream » The Nature-Study Review, Chicago, School of Education University of Chicago, 1912.

Possibly they may be first discovered on the bottom of some clear pool in which the youth wil be startled to see some little masses of stones and sticks which look like the other objects on the bottom but which move. There are the cases or houses of the caddice fly larvae (sometimes called caddices worms) and a little further search about the collecting groundswill reveal a surprising variety in the way in which these cases are built. Some are made of small pebbles and sand ; some are made of little sticks crossed up in such a way as to make a tiny log cagin affair ; some are made of sticks placed lengthwise ; some are made of bits of leaves and grass, and so on.