The Law of Demand and Supply is existent in the body in its ideal state; wherein the "clearing house" is the brain, Innate the virtuous "banker," brain cells "clerks," and nerve cells "messengers."
In order that Innate may make demand of all the tissues cells under her jurisdiction, in harmony with the organization, she must receive the demands from all the tissues cells in order to know their needs. She must have Ideation in order to make Intellectual Adaptation. The supply of forces comes from Innate directly, and the supply of materials reaches the demanding cells through the Serous Circulation. It is evident, then, that the two most important cycles upon which the others are based are the Normal Complete Cycle, and the Serous Cycle.