The book Imaginal Discs in Insects was written by author Henry Sherring Pratt Here you can read free online of Imaginal Discs in Insects book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Imaginal Discs in Insects a good or bad book?
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In the body cavity of the caterpillar, for instance, buried beneath the dorsal meso- and metathoracic integument are two pairs of small disc-like islands of cells. These remain unfunctional and inactive dur- ing the caterpillar's lifetime although growing constantly, but during its meta- morphosis they develop into the two pairs of wings of the butterfly.* Similar cell- islands are present in the larval coleop- teron.f The lai*val hymenopteron also possesses them f ; while beneath its ventral t...horacic integument are three other pairs of cell-islands whose fate it is to furnish the imaginal legs. In the nematocera, also, ventral and dorsal pairs of cell-islands are present in the larva, as the observations of Weismann on Corethra J first showed. This classic investigation demonstrated the presence of three dorsal pairs of cell- islands as well as three ventral pairs. They are sit- uated in the body cavity of the larva just beneath the integument, a dorsal and a ventral pair in the prothorax, destined to form the pupal spiracles and the *Swammerdam.
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