Bulletin of the Lloyd Library of Botany, Pharmacy and Materia Medica: Entomological Series, Nos. 1-5; 1921-1926 (Classic Reprint)

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Excerpt from Bulletin of the Lloyd Library of Botany, Pharmacy and Materia Medica: Entomological Series, Nos. 1-5; 1921-1926

Whether the caddis-worms construct portable cases, or silken tubes, or make no cases until almost time for pupation, they all secrete a glue, or silk, through Openings in the lower lip, or labium. This silk is produced in large glands within the body cavity. These glands, like the silk-secreting glands of caterpillars, are modifications of the salivary glands, to meet the larvae's needs for silk. The silk is emitted as a liquid, but has the remarkable char acter of hardening immediately after expulsion from the larvae's bodies and of adhering fast to submerged objects, though they be wet and saturated with water. The silk is not usually spun in fine strands, as is that of the Lepidoptera, but is more glue-like, form ing a homogeneous sheet over the object cemented.

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