The Classification of Insects From Embryological Data
The book The Classification of Insects From Embryological Data was written by author Louis Agassiz Here you can read free online of The Classification of Insects From Embryological Data book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Classification of Insects From Embryological Data a good or bad book?
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All the ornamented appendages of this skin, its well-articu- lated legs, its feathery wings, its articulated antennae, its facetted eyes, its elongated movable maxillae, when perfect, remain separate from each other, movable upon each other, and independent in their functions, and do not undergo again a fusion similar to that by which the case of the pupa was formed and thickened. The only connection which grows more intimate in the perfect animal than it was in the pupa is that of the two maxi...llse, which henceforth are united along the middle line, and between which a groove is left to form the curved proboscis. Gradually all these parts are loosened from the inner surface of the pupa-case, they acquire their peculiar coloring, and, the pupa-case bursting upon the back, the perfect insect comes out in all its beauty. At first the wings, however, are shorter and narrower than afterwards, when they have been expanded, stretched, and moved to prepare for their final function. Sometimes, before being hatched, the process of these last changes may be noticed through the skin of the pupa, which grows more trans- parent in proportion as it is loosened from the surface of the insect within.
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