File:Animal and vegetable physiology, considered with reference to natural theology (1836) (14578284387).jpg

Identifier: animalvegetable01roge (find matches)
Title: Animal and vegetable physiology, considered with reference to natural theology
Year: 1836 (1830s)
Authors: Roget, Peter Mark, 1779-1869
Subjects: Biology Physiology Plant physiology Natural theology
Publisher: Philadelphia, Carey, Lea & Blanchard
Contributing Library: NCSU Libraries
Digitizing Sponsor: NCSU Libraries

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■4>. • Carnhus sycophanta. Linn. 22S THE MECHANICAL FUNCTIONS. The head contains the brain, or principal enlargement ofthe nervous system, and the organs of sensation and of mas-tication. Its size, as compared with the rest of the body,
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varies much in different insects, and is in general propor-tionably larger than it is in the larva state. Its integument,which, from analogy with vertebrated animals, has beencalled the skull, or cranmm, (c, Fig. 150,) is usually thehardest part of the general crust. Although it may appear,on a superficial examination, to consist of a single undividedpiece, yet, on tracing its gradual formation, it is found to bein reality composed of a union of several of the segments ofthe larva. Audouin and Carus distinguish three component STRUCTURE OF INSECTS. Qoq segments in the cranium of insects; while Straus Durckhcimconsiders it as formed by the consolidation of no less thansix segments of the vermiform larva. According to thistheory, the same elements which in the thoracic segmentsare developed into feet, are here employed to form partshaving other destinations. From the segment adjacent tothe thorax the antennae are supposed to be developed. Thetwo anterior segments belong properly to the

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