Photoperiodic regulation of insect and molluscan hormones -- Contents -- Chairman's opening remarks -- Introduction: the links between 'wet' and 'dry' physiology -- Unity and diversity in insect photoperiodism -- Discussion -- The circadian component in photoperiodic induction -- Discussion -- Photoperiod reception in spider mites: photoreceptor, clock and counter -- Discussion -- Long-night summation and programming of pupal diapause in the flesh-fly, Sarcophaga argyrostoma -- Discussion -- GENERAL DISCUSSION -- Effect of temperature on the photoperiodic clock in Megoura viciae -- Long- and short-day effects on diapause induction in Pyrrhocoris apterus -- Genetic analysis of geographical variation in photoperiodic diapause and pupal eclosion rhythm in Drosophila littoralis -- Discussion -- Neuronal organization of a circadian clock in the cockroach Leucophaea maderae -- Discussion -- Circadian-clock control of hormone secretion in Samia Cynthia ricini -- Discussion -- Circadian control of haemolymph ecdysteroid titres and the ecdysis rhythm in Rhodnius prolixus -- Discussion -- Photoperiodic regulation of prothoracicotropic hormone release in late larval, prepupal and pupal stages of Sarcophaga bullata -- Discussion -- Reproductive endocrinology and photoperiodism in a terrestrial slug -- Discussion -- Photoperiodicity, rhythmicity and endocrinology of reproduction in the snail Lymnaea stagnalis -- Discussion -- Physiological aspects of the two oscillators that regulate the timing of eclosion in moths -- Discussion -- A hormonal basis for the photoperiodic control of polymorphism in aphids -- Discussion -- Environmental signals, the neuroendocrine system, and the regulation of larval diapause in the southwestern corn borer, Diatraea grandiosella -- Discussion -- CONCLUDING GENERAL DISCUSSION -- Models, hormone titres and clocks.

Concluding comments -- Index of contributors -- Subject index.