. Elements of entomology: an outline of the natural history and classification of British insects. Insects -- Great Britain. EXTERNAL SKELETON. as the ordinary Crustacea^ this hardness is obtained by the deposition of calcareous matter^ principally carbonate of lime (or chalk) ^ in the skin; but in the rest it is pro- duced simply by a thickening of the skin in those particular parts, leaving the inter- vening portions soft and flexible. Thus the body of an articulated ani- mal may be regarded as a jointed tube; and as the skin of the limbs and other appendages is also hardened in the same or
. Elements of entomology: an outline of the natural history and classification of British insects. Insects -- Great Britain. EXTERNAL SKELETON. as the ordinary Crustacea^ this hardness is obtained by the deposition of calcareous matter^ principally carbonate of lime (or chalk) ^ in the skin; but in the rest it is pro- duced simply by a thickening of the skin in those particular parts, leaving the inter- vening portions soft and flexible. Thus the body of an articulated ani- mal may be regarded as a jointed tube; and as the skin of the limbs and other appendages is also hardened in the same or even a greater proportion, the whole skin of the creature forms a sort of case within which all the soft parts are securely sheltered. To this firm skin are attached the muscles, by which the movements of the dif- ferentparts are efiected; and as these act upon their points of sup- port in exactly the same way that the muscles of man do upon the bones of his skeleton, the hardened covering of these animals has been denominated their skeleton; but with this difierence, that whilst in the. The external skeleton of an Insect, a. The head, with the eyes, the bases of the antennas, and the palpi, b. The pro- thorax, with the first pair of legs. c. The mesothorax, with the second pair of legs, and the bases of the first pair of wings, d. The metathorax, with the third pair of legs, and the bases of the second pair of wings, e. The femur or thigh. /. The tibia or shank, g. The tarsus, h. The abdomen, i. The Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Dallas, W. S. (William Sweetland), 1824-1890. London, J. van Voorst
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectinsectsgreatbritain
