Animal and vegetable physiology, considered with reference to natural theology, by Peter Mark Roget .. . groove termed, by Linneus, the ambulacrum, oravenue, a name which it has received from itsfancied resemblance to a walk between rows oftrees : for each groove contains a quadruple rowof perforations, like pin holes, through whichsmall fleshy cylindrical processes pass. Theseprocesses extend but a short distance from thesurface; but they admit of being elongated, orretracted, at the pleasure of the animal, by avery curious mechanism, which I shall presentlydescribe. By bending them on either
Animal and vegetable physiology, considered with reference to natural theology, by Peter Mark Roget .. . groove termed, by Linneus, the ambulacrum, oravenue, a name which it has received from itsfancied resemblance to a walk between rows oftrees : for each groove contains a quadruple rowof perforations, like pin holes, through whichsmall fleshy cylindrical processes pass. Theseprocesses extend but a short distance from thesurface; but they admit of being elongated, orretracted, at the pleasure of the animal, by avery curious mechanism, which I shall presentlydescribe. By bending them on either side, in 202 THE MECHANICAL FUNCTIONS. their expanded state, the Asterias is capable ofeffecting a slow progressive motion; so that theseprocesses may be regarded as corresponding tofeet, being levers for the advance of the , it may be remarked, is the first time thatwe meet with organs of that description in ourprogress through the animal kingdom. Each ofthese feet is terminated by a concave disk, whichwhen applied to any flat surface acts as a sucker,on the principles already adverted to
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Keywords: ., bookcentury18, booksubjectnaturaltheology, booksubjectphysiology
