The laws and mechanics of circulation, with the principle involved in animal movement . hin themselves ; hence, the fluids shouldflow into the vessels again from the interstices, being from * This remark was evoked by the fruitless search for the heart of a fly. 176 CIRCULATION IN THE TISSUE INTERSTICES. high to low pressure, in conformity with universal law. J nother words, the fluids should flow into and out of the inter-stices from the capillaries during their rhythmical contrac-tions and expansions, for the same reason precisely that theyflow into and out of the lungs, pressure alike apply
The laws and mechanics of circulation, with the principle involved in animal movement . hin themselves ; hence, the fluids shouldflow into the vessels again from the interstices, being from * This remark was evoked by the fruitless search for the heart of a fly. 176 CIRCULATION IN THE TISSUE INTERSTICES. high to low pressure, in conformity with universal law. J nother words, the fluids should flow into and out of the inter-stices from the capillaries during their rhythmical contrac-tions and expansions, for the same reason precisely that theyflow into and out of the lungs, pressure alike applying to itall. The blood corpuscles being too large to pass the sto-mata, pass on, of course, into the venous system, but yieldingup their oxygen, which very probably passes with the liquorsanguinis through the stomata to the cell-brood, as this wouldgreatly facilitate the passage through the membrane. In thismanner, then, the nutritive and force-producing elements arepumped into and out of the interstices for the due supplyof the cell-brood ; and which is readily increased or dimin-. Fi. -An Ideal Diagram of the Tissue-Circulation, showing the relations which thecapillaries sustain to the tissues. 1, 1, 1, lumen of capillary vessels. ished upon occasion in correspondence with the exigencies inthe functions, thus giving them complete control of their ownsupplies, which the scheme calls for; otherwise it must in-evitably fail, the sole purpose in all the vascular arrange-ments being the due supply of the cell-brood or workmen inthe tissues through whose instrumentality all the phenomenaare evolved ; and failing at one point, the vascular chainwould be broken, since it all rests upon this power of produc-ing rapid rhythmical changes in pressure for increasing circu-lation commensurate with the physiological requirements,no other means applying for the purpose. Thus it is mani- CIECULATIOIS I]ST THE TISSUE INTERSTICES. 177 fest, for feeding the cell-brood and removing waste product
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