Note w — BOOK IV. (continued 2)

The several Sorts of Phryganea, or Cadews, in their Nympha, or Maggot-state, thus house themselves; one Sort in Straws, call’d from thence Straw-Worms; others in two or more Sticks, laid parallel to one another, creeping at the Bottom of Brooks; others with a small Bundle of Pieces of Rushes, Duck-weed, Sticks, &c. glu’d together, where-with they float on the Top, and can row themselves therein about the Waters, with the Help of their Feet: Both these are call’d Cob-bait. Divers other Sorts there are, which the Reader may see a Summary of, from Mr Willughby, in Raii Method. Insect. p. 12. together with a good, though very brief Description of the Papilionaceous Fly, that comes from the Cod-bait Cadew. It is a notable architectonick Faculty, which all the Variety of these Animals have, to gather such Bodies as are fittest for their Purpose, and then to glue them together; some to be heavier than Water, that the Animal may remain at the Bottom, where its Food is; (for which Purpose they use Stones, together with Sticks, Rushes, &c.) and some to be lighter than Water, to float on the Top, and gather its Food from thence. These little Houses look coarse and shew no great Artifice outwardly; but are well tunnelled, and made within with a hard tough Paste; into which the hinder Part of the Maggot is so fix’d, that it can draw its Cell after it any where, without Danger of leaving it behind; as also thrust its Body out, to reach what it wanteth; or withdraw it into its Cell, to guard it against Harms.