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Continuing the thread of reasoning, we may deduce the presence of vascularsystem or something equivalent to it, all creatures of any kindwas sizes and activities. A comparatively small inert animal, asHydra, for example, which consists almost only out of the bag with two walls(the external side of cells forming the skin, and the inner formingthe suction surface), does not require special apparatus, carryingthe absorbed food in the body, because her body is not much different from shellfor food, consisting in it. But when the volume is significant or whenthe activity is such that requires a lot patrati in the body and resumespent, or, finally, when both conditions coincide, isan obvious need in the system of blood vessels. Besides thatthere is a proper size surface suction food and air, whenno known modes of transmission of absorbed elements to the wholethe body or does not use, or too little of it. It is clear thatthere's got to be carrying the channels. If, like jellyfish, conductorsthese consist simply of branched canals, radiating from the stomach tosurface, we can conclude a priori that such organismsrelatively inactive: food, propagating thus onthe body not processed; it is soon dissolved; to keep it inthe movement does not have the proper apparatus. On the contrary, when we see the bodyof considerable size, exhibiting a lot of vitality, we can make apriori that it has apparatus for continually deliveryconcentrated food and oxygen to each organ, i.e. there is throbbingvascular system.
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