A curious faculty

William Barker DanielRural Sports, vol. II, Londres, Longman, 1812, p. 291-292.

The several kinds of Cadews, in their Nympha or maggot state, thus house themselves ; one sort in Straws, called from thence Straw-worms; others in two or more parallel sticks, creeping at the bottom of brooks; a third, in a small bundle of pieces of rushes, duck-weed, &c. glued together, wherewith they float on the surface, and can row themselves about the water with the help of their feet; both these are called Cad-bait. It is a curious Faculty that these creatures possess, of gathering such bodies as are fittest for their purpose, and then so gluing them together, some to be heavier than water, that the Animal may remain at bottom where its food is, and others to be so buoyant as to float, and there collect its sustenance; theses houses are coarse and shew not outward art, but are within well tunnelled and have a tough hard paste, into which the hinder part of the Maggot is so fixed, that its cell can be drawn after it without danger of leaving it behind, and it can also thrust out its body to reach the needful supplies, or withdraw into its covering for protection and safety.