The laws and mechanics of circulation, with the principle involved in animal movement . mal cement, which fills up the interstices PHYSIOLOGICAL ANATOMY. 217 (Fig 82, 5), present an appearance not unlike a mosaic pave-ment (81, b). But when macerated in water, they are easilyloosened by pressure (Fig. <? 2, a); the splitting up of the lidsthrough the perforations giving them the appearance of cilia,is a result of post-mortem changes in the cells. Thus con-stituted, then, the force in the muscular cylinder is readilybrought to bear for compelling the liquid aliment into thosemyriads of littl
The laws and mechanics of circulation, with the principle involved in animal movement . mal cement, which fills up the interstices PHYSIOLOGICAL ANATOMY. 217 (Fig 82, 5), present an appearance not unlike a mosaic pave-ment (81, b). But when macerated in water, they are easilyloosened by pressure (Fig. <? 2, a); the splitting up of the lidsthrough the perforations giving them the appearance of cilia,is a result of post-mortem changes in the cells. Thus con-stituted, then, the force in the muscular cylinder is readilybrought to bear for compelling the liquid aliment into thosemyriads of little organs (each one of which may be regardedas a distinct gland in itself) that are spread out like a sheetover the external surface of the villi for effecting furthermetamorphosis upon the aliment, thence into the parenchyma ofthe villi, thence into the vessels, as before stated ; the structuresin the villus—epithelium, blood-capillaries, and central lactealembraced by its special muscles (Fig. 98, Z, m\ all acting to-gether and in harmonious concert with the force in the muscu-. Fig. 81.—Columnar Cells from the Small Intestine of the Rabbit, a, Side view of cellswith thickened raised lids traversed by pores ; 6, view from above, in which theorifices of the pores appear like dots.—Frey. lar cylinder for compelling rapid absorption. This additionalforce in the fine adjustment spoken of in the muscularismucosae must necessarily increase the action, since therhythmical contractions and expansions in the muscularfasciculi that penetrate the parenchyma and form thewall of the central lacteal, could not otherwise than havethat effect, must do so, in the very nature of things, actingas a little suction-pump and increasing circulation in thevessels correspondingly. And with high intra-intestinalpressure produced by the muscular cylinder and the gases inthe intestines, together with this pumping action in the villi,absorption should go on very rapidly, as a matter of course ;while
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