Silk industry of Cheshire Peak District. Fast flowing streams forming the River Dane, River Bollin, River Dean and River Goyt provided a moist environment and potential power to drive waterwheels in mills. The coach road from Derby to Manchester passes through, or near to each of the prominent silk towns, and later in 1831 Macclesfield Canal joined Congleton, Macclesfield and Bollington to the Trent and Mersey Canal and the Midlands and the seaports. Silk is a naturally produced fibre obtained from many species of the silk moth. In 1700 the favoured silk was produced by a moth (Bombyx mori), that used it to spin
Dauer larva as "L1", "L2", "L3" and "L4". After L4, animals moult to the reproductive adult stage. However, when the environment is unfavorable, L1 and L2 animals have the option to divert their development from reproduction to dauer formation. Signals such as temperature, food supply, and levels of a dauer-inducing pheromone, a population density cue, influence this dauer decision. Dauer larvae are thus considered an alternative L3 stage larva, and this stage is sometimes preceded by L2d. L2d animals are considered pre-dauer and are characterised by delayed development and dark intestines produced by storage of fat. L2d larvae can either continue normal