File:Animal and vegetable physiology, considered with reference to natural theology (1836) (14764423872).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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of thepoison bag, b. This bag is of an ovalshape, and is not the organ which se-cretes the poison, but merely a recep-tacle for containing it: for it is conveyedinto this bladder by means of a long con-voluted vessel, c, which receives it fromthe secreting organs, s. These organsconsist of two somewhat dilated vesselsresembling caeca, but which have each aslender secretory vessel extending fromthem. The sting moves in a tubularsheath, v; which is open at its base, andalong its upper surface, as far as thepart where the sting is prevented frombeing thrust out any farther. The mus-cles which move the sheath are distinct from those of the sting, and are at-tached to an elongated and curved part on each side of its base, and to anarched and moveable part which is apparently articulated with it. Swam-merdam has delineated these parts as caeca in his dissection of the commonhive bee, but has not noticed the secretory vessels. The sting of the hivebee resembles that of the Anthophora retusa.
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PLIGHT or INSECTS. 249 They are named the hdUeres, or poisers, from their sup-^Dosed use in balancing the body, or adjusting with exactnessthe centre of gravity when the insect is flying. Whatevermay be their real utility, they may still be regarded as rudi-ments of a second pair of wings; and they afford, therefore,when thus viewed, a striking instance of the operation ofthe tendency which prevails universally in the animal king-dom, and modifies the structure of each individual part so asto preserve its conformity to one general type. The innumerable tribes of butterflies, sphinxes, and moths,are all comprehended in the order Lcjndoptcra, and are dis-tinguished by having wings covered with minute plumes orscales. These scales are attached so slightly to the membraneof the wing as to come off when touched with the fingers, towhich they adhere like fine dust. When examined withthe microscope, their construction and arrangement a()pearto be exceedingly beautiful, being marked with para

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