The average person has a general understanding of what is meant by "the nervous system," but inquiry will show that by this term he usually includes only that part of the nervous system which is known as the "cerebro-spinal system," or the system of nerves consisting of the brain and spinal cord, and the nerves extending therefrom throughout the body, the offices of which are to control the voluntary movements of the body. The average person is almost entirely ignorant of the existence of the Great Sympathetic System which controls the involuntary movements and processes, such as the processes and functions of nutrition, secretion, reproduction, excretion, the vaso-motor action, etc. In physiology, the term "sympathetic" is used in the sense of: "Reciprocal action of the different parts of the body on each other; an affection of one part of the body in consequence of something taking place in another. Thus when there is a local injury, the whole frame after a time suffers with it. A wound anywhere will tend to create feverishness everywhere; derangement of the stomach will tend to produce headache, liver complaint to produce pain in the shoulder, etc." An old authority thus describes the Sympathetic Nerves: "A system of nerves, running from the base of the skull to the coccyx, along both sides of the body, and consisting of a series of ganglia along the spinal column by the side of the vertebræ. With this trunk of the sympathetic there are communicating branches which connect the ganglia, or the intermediate cord, with all the spinal and several of the cranial nerves proceeding to primary branches on the neighboring organs or other ganglia, and finally numerous flexures of nerves running to the viscera. Various fibers from the sympathetic communicate with those of the cerebro-spinal system. The term 'sympathetic' has been applied on the supposition that it is the agent in producing sympathy between different parts of the body. It more certainly affects the secretions." In the New Psychology the Sympathetic Nervous System is recognized as that directly under the control of the Subconscious Mind.