File:Animal and vegetable physiology, considered with reference to natural theology (1836) (14578302307).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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ose of preparing- the skeleton. 336 THE MECHANICAL FUNCTIONS. rently corresponding to pelvic bones, for the presence ofwhich no more probable reason can be assigned than thetendency to preserve an analogy with the more developedstructures of the same type. A similar adherence to the lawof uniformity in the plan of con-struction of all the animals belong-ing to the same class, is strikinglyshown in the conformation of thebones of the anterior extremities ofthe cetacea; for, although they pre-sent, externally, no resemblance tothe leg and foot of a quadruped, beingfashioned into fin-like members, wdtha flat, oval surface, for striking the wa-ter, yet, when the bones are strippedof the thick integument which coversthem and conceals their real form,we find them, (as may be seen in Fig.216) exhibiting the same divisionsinto carpal and metacarpal bones, andphalanges of fingers, as exist in themost highly developed organization,not merely of a quadruped, but alsoof a monkey, and even of man.
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§ 3. */lmphibia. In the small tribe denominated by Cuvier Amphibia, andconsisting of the Phoca, or Seal, and the Tricheciis, orWalrus, we perceive that an advance is made towards afuller development of the limbs: these animals having a dis-tinct neck and pelvis, and both hind and fore extremities.In the seal the hind legs are drawn out posteriorly to a con-siderable length, and placed parallel to each other: whenunited and alternately raised and depressed, they perform AMPHIBIA. 337 the same office as the tail of the cetacea, and propel the ani-mal forwards: but when employed scparatcl), they are morequalified to act as oars. The walrus has feet still more de-veloped, and distinctly divided into toes, which arc disposedso as to strike backwards against the water. § 4. Ma7717711 fcroils Quachnipeds in general. From the imperfectly developed aquatic and amphibioustribes, we gradually ascend to the more finished structures ofmammiferous quadrupeds, which are expressly fitted forprogres

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