Animal and vegetable physiology, considered with reference to natural theology, by Peter Mark Roget .. . met with, for the obviouspurpose of facilitating motion; and here alsofriction is prevented by a highly lubricating fluid,termed synovia, which is poured out between thesurfaces of the membrane lining the , being impeimeable to fluids, are ANIMAL ORGANIZATION. 103 extensively employed as receptacles for retain-ing them: forming, in the first place, sacs, orpouches of various kinds for that purpose. Theink-bag of the cuttle fish, the gall-bladder, andeven the stomach itself
Animal and vegetable physiology, considered with reference to natural theology, by Peter Mark Roget .. . met with, for the obviouspurpose of facilitating motion; and here alsofriction is prevented by a highly lubricating fluid,termed synovia, which is poured out between thesurfaces of the membrane lining the , being impeimeable to fluids, are ANIMAL ORGANIZATION. 103 extensively employed as receptacles for retain-ing them: forming, in the first place, sacs, orpouches of various kinds for that purpose. Theink-bag of the cuttle fish, the gall-bladder, andeven the stomach itself, are examples of thiskind of structure. The coats of these sacs,being very extensible and elastic, readily ac-commodate themselves to the variable bulk oftheir contents. In the second place, we find membranescomposing tubes of various descriptions for con-ducting fluids. Thus, in the higher classes ofanimals, the whole of the body is traversed byinnumerable canals conveying different kindsof fluids. These canals, when uniting intotrunks, or subdividing into branches, are calledVessels (Fig. 26). 27.
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