The laws and mechanics of circulation, with the principle involved in animal movement . ecation, urination—inshort to all the hollow viscera, since they all relate to circula-tion, and the maintenance of a balance in the organism; other-wise these actions also would be meaningless. Thus in thecase of the nursing infant (B) can it be doubted for a singlemoment even that the same principle applies for compellingthe mammary secretions in the mouth-cavity, as in thechamber of the breast-pump (B), or the production of alower pressure in the cavity than in the mammary gland,the fluid flowing from hi
The laws and mechanics of circulation, with the principle involved in animal movement . ecation, urination—inshort to all the hollow viscera, since they all relate to circula-tion, and the maintenance of a balance in the organism; other-wise these actions also would be meaningless. Thus in thecase of the nursing infant (B) can it be doubted for a singlemoment even that the same principle applies for compellingthe mammary secretions in the mouth-cavity, as in thechamber of the breast-pump (B), or the production of alower pressure in the cavity than in the mammary gland,the fluid flowing from high to low pressure in conformitywith universal law \ (And it is more than probable, as the PRESSURE FUNDAMENTAL IN THE BODY. 43 secretions are being thus withdrawn, that the irritations pro-pagated from the skin-surface are reflected thence upon themilk ducts, which causes them to contract for increasing press-ure, whereby the flow into the mouth-cavity is expedited).Furthermore, that the same principle applies for compellingthem thence into the stomachal cavity represented in the. Fig. 8.—Familiar Modes of Pumping the Fluids out of the Body, showing that theyrespond to changes in pressure. warns of deglutition, which consist in an anterior expansionfor diminishing pressure with a posterior contraction for in-creasing it, whereby the journey of the fluid or the bolus alongthe canal is greatly expedited, the waves following each otherin rapid succession till the stomachal cavity is reached. In 44 PRESSUBE FUNDAMENTAL IN THE BODY. short, that deglutition is based upon rhythmical changes inpressure, otherwise is inexplicable. Also, that the same appliesfor the sucking leech (c), which is feeding in the capillaries ofits victim, while the undulations coursing along its tubularbody from the mouth-cavity are analogous with deglutition, ofwhich it is archetypal, the principle in mechanics being thesame for both, while the structures are fundamentally thesame, of which more anon. F
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