In addition, these activities, which are so all-important, determine the basic conduct by arousing the basic appetites and desires of the individual. It is the change in the gastro-intestinal tract and in the tissues of the body that starts up the hunger feeling and the impulses which prompt men to seek food; in other words, this type of coenaesthesia has set going all the physical and mental activities relating to food; it is the basic impulse behind agriculture and stock raising, as well as energizing work activities of all kinds. It is the tension in the seminal vessels of the male that wakes up his passion, if it is not the sole source of that passion. Sex desire in the adult male has many elements in it, not pertinent at present, but the coenaesthetic influence of the physical structures is its starting point. In men as well as women there is a cycle of desire, with height due to physical tension and abyss following the discharge or disappearance of tension, that profoundly influences life and conduct. Here the sympathetic nervous system and the internal secretion of the genital glands awaken into sexual activity brain, spinal cord and muscles, so that the individual seeks a mate, plunges into marriage and directs his conduct, conscious of taste and desire, but largely unconscious of the physical condition that is impelling him on. In this sense the subconscious activities dominate in life, because the functions of nutrition and reproduction are largely unconscious in their origin, but there is no organized, plotting subconsciousness at work. Once a thing is experienced, it is stored in memory. What is the basis and position of a memory when we are not conscious of it, when our conscious minds are busy with other matters? What happens when a desire is repressed, inhibited into inaction; when consciousness revolts against part of its own content? Is a "forgotten" memory ever really lost, or a desire that is squelched and thrust out of "mind" really made inactive? Do our inhibitions really inhibit, or do we build up another self or set of selves that rise to the surface under strange forms, under the guise of disease manifestations? Sigmund Freud and his followers have made definite answers to the foregoing, answers that are incorporated in a doctrine called Freudianism. Freud is an Austrian Jew, a physician, and one that soon specialized in nervous and mental diseases. Early in his career he did some excellent work in the study of the paralysis of childhood (infantile hemiplegia), but his attention and that of an older colleague, Breuer, were soon drawn (as has occurred to almost every neurologist) to the manifestations of that extraordinary disease, hysteria. Hysteria has played so important a role in human history, and Freud's ideas are permeating so deeply into modern thought that I deem it advisable to devote a chapter to them. CHAPTER V. HYSTERIA, SUBCONSCIOUSNESS AND FREUDIANISM