Armor of sticks and mica scales

Robert Tuttle Morris, Hopkin’s Pond and other Sketches, New York, Putnam G.P., 1896, pp. 46-47.

Formely he would quietly leave the eddy on a late september day, and go down stream to a shallow nook where a lively spring made the sand boil up at the bottom in four or five puffs at a time; Where the caddis worm built their armor of sticks and mica scales, and where alders growing thickly, arched their branches overhead and shaded the pool.