File:Animal and vegetable physiology, considered with reference to natural theology (1836) (14578112358).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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r bodiessufficiently secures them from any danger arising from falls.Some insects are furnished with a still more refined andeffectual apparatus for adhesion, and one which even enablesthem to suspend themselves in an inverted position from theunder surfaces of the bodies. It consists of suckers, the ar-rangement and construction of which are exceedingly beau-tiful; and of which the common house-fly presents us withan example. In this insect that part of the last joint of thetarsus which is immediately under the root of the claw, hastwo suckers appended to it by a narrow funnel-shaped neck,moveable by muscles in all directions. These suckers areshown in Fig. 152, which represents the under side of tbefoot oiMusca vomitoria^ or blue-bottle fly, with the suckersexpanded. The sucking part of the apparatus consists of amembrane, capable of contraction and extension, and theedges of which are serrated, so as to fit them for the closestapplication to any kind of surface. In the Tahcmiis, or
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horse-fly, each foot is furnished with three suckers. Inthe Cimbex hUea, or yellow saw-fly, there are four, of which 236 THE MECHANICAL FUNCTIONS. one is placed upon the under surface of each of the four firstjoints of the toes, (Fig. 153;) and all the six feet are pro-vided with these suckers. In the Dyiisciis niarginaliSysuckers arc furnished to the feet of the male insect only.The three first joints of the feet of the fore-legs of that in-sect have the form of a shield, the under surface of which iscovered with suckers having long tubular necks: there isone of these suckers very large, another of a smaller size,and a great number of others exceedingly small. A few ofthe latter kind are represented highly magnified in Fig. 154.In the second pair of feet, the corresponding joints are pro-portionally much narrower, and are covered on their undersurface with a multitude of very minute suckers. The Jicri-diinn biguttiihivi, wdiich is a species of grasshopper, hasone large oval sucker, u

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