A glutinous fluid

Philip Henry Gosse« On the Architectural Instincts of Melicerta ringens, an Animal of the Class Rotifera », The Transactions of the Microscopical Society of London, Londres, E. Newman, vol. III, 1852.

The caddis-worms, so familiar to anglers (the larvae of the Phryganeadae), collect little stones, shells and other extraneous bodies lying at the bottoms of streams, and fixing them with a glutinous fluid their mouths, from them into curious cylindrical cases.