ABSTRACT
Human thought and conduct are intimately connected with the working of the nervous system, by which is meant the brain and spinal cord, the nerves from these to the organs of sense and to the muscles, the nervous tissue ,in the organs of sense, and the sympathetic system-and local ganglia. Injuries to or diseases of the nervous system cause marked changes in thinking and action. Brain tumors may result in disordered thinking; diseases of certain nerves cause inability to move the corresponding muscles; disease of the optic nerve causes blindness. Drugs which affect the nervous system, such as chloroform, alcohol and hashish, produce mental symptoms. The development of the nervous system in child life parallels the growth of bodily control, intellect and character. From a vast amount of such evidence as this it is abundantly shown that the thoughts and feelings and behavior of men are in direct relations-with the activities of the nervous system.
