The laws and mechanics of circulation, with the principle involved in animal movement . uld be more simple or more principle is not new either, but old—old as Nature!Only it had not been applied to the animal body for elucidatingthe vital phenomena; as though the body could be outsideand independent of this fundamental force in Nature for con-trolling the movement of the fluids upon which the very bodyitself is based. 60 COORDINATION OF INTERNAL AND EXTERNAL PAUTS. One other circumstance, of great importance in this connec-tion, remains for mention, namely : The Progressive Incre
The laws and mechanics of circulation, with the principle involved in animal movement . uld be more simple or more principle is not new either, but old—old as Nature!Only it had not been applied to the animal body for elucidatingthe vital phenomena; as though the body could be outsideand independent of this fundamental force in Nature for con-trolling the movement of the fluids upon which the very bodyitself is based. 60 COORDINATION OF INTERNAL AND EXTERNAL PAUTS. One other circumstance, of great importance in this connec-tion, remains for mention, namely : The Progressive Increase in Size with Ingestion.—As thereis no unoccupied space in the body, it follows there must becorresponding increase in size with ingestion, a circumstancewhich also has forcible illustration in the worms (Figs. 15, 16,17); the gorged leech, for example (Fig. 17), being severaltimes the natural size in the empty condition (Fig. 15). Thisis all brought about gradually, the waves of expansion pass-ing from the mouth-cavity along the body of the sucking Pig. 15. Fig. 16. Fig.
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