Force is that which originates or arrests motion. Vital force is the energy which gives life or action to an organism, the vital power which distinguishes living matter from the dead. Organic force is the inherent vigor latant in an organ. Nerve force is the power or ability to conduct impulses. Reserve force is the energy which is stored in an organ or organism that is not required for normal functionating.
Intelligent actions are the expressions of the sum total of life.
This intelligence is able to accumulate and store energy derived from without. Certain fixed and definite conditions release this energy. The condition of an organ suitable for health is known as tone. Tone consists of normal tension, normal firmness and normal renitency. When nerves have the proper tension, the suitable solidity and the required resisting force, health is the result.