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. A manual for the study of insects. Insects. S6 THE STUDY OF INSECTS. grow no larger, except that in case of females the body may be distended by the growth of eggs within it. While many adults eat more or less, it is only to sustain life, and not for growth. Indeed, many adult insects take very little food, and some have lost their mouth-parts entirely, through disuse. The adult stage usually lasts for a considerably shorter time than the larval or nymph stages. In fact, it seems planned in the economy of nature that the grown-up insects should Hve only long enough to lay eggs, and thus secu

. A manual for the study of insects. Insects. S6 THE STUDY OF INSECTS. grow no larger, except that in case of females the body may be distended by the growth of eggs within it. While many adults eat more or less, it is only to sustain life, and not for growth. Indeed, many adult insects take very little food, and some have lost their mouth-parts entirely, through disuse. The adult stage usually lasts for a considerably shorter time than the larval or nymph stages. In fact, it seems planned in the economy of nature that the grown-up insects should Hve only long enough to lay eggs, and thus secu Stock Photo
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The Book Worm / Alamy Stock Photo

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RD7GDF

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2969 x 842 px | 25.1 x 7.1 cm | 9.9 x 2.8 inches | 300dpi

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. A manual for the study of insects. Insects. S6 THE STUDY OF INSECTS. grow no larger, except that in case of females the body may be distended by the growth of eggs within it. While many adults eat more or less, it is only to sustain life, and not for growth. Indeed, many adult insects take very little food, and some have lost their mouth-parts entirely, through disuse. The adult stage usually lasts for a considerably shorter time than the larval or nymph stages. In fact, it seems planned in the economy of nature that the grown-up insects should Hve only long enough to lay eggs, and thus secure the perpetuation of the species. The External Anatomy of Insects. The subject of insect anatomy is separated into two divi- sions : one, treating of the structure of the body-wall or skeleton; the other, of the internal organs. The former is termed external anatomy; the latter, mternal anatomy. In our own bodies we find a central framework or skele- ton, about which are arranged the muscles, blood-vessels, nerves, and other organs. But insects are constructed on an entirely different plan: with them the supporting skele- ton is outside, and the muscles, nerves, and other organs are within this skeleton. The difference can be well seen if the figure showing the internal structure of the leg of a May-beetle (Fig. 6f) be compared with one of our own limbs, either arm or leg.. Fig. 67.—Leg- of May-beetle. (After Straus-Durckheim.) The body of an insect is built on the same plan as are its legs. The outside of the body is more or less firm, being hardened by chitine ; and this firm outer wall supports the muscles and other organs, thus serving as a skeleton. The skeleton is therefore, in general outline, a hollow cylinder.. 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 work.. Comstock, John Henry, 1849-1931; Coms

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