On the one hand, the automatic performance of work saves an enormous amount of brain energy; on the other hand, bad habits may be formed whose effects may be most pernicious, and which are gotten rid of only with the greatest difficulty. An example of the first is the young child learning to walk; at first he accomplishes the feat only by the fixed concentration of every power of the brain on the act; whereas the healthy adult walks automatically, without paying the least regard to the movements or the manner in which they are accomplished. Hysteria and ungovernable outbursts of passion furnish good examples of the bad habits that may be formed, owing to the lack of discipline and the powers of inhibition; every time that a woman gives way to one of these outbursts, so much the harder will it be for her to prevent or control another outbreak. Inhibition is the highest and most important function of the brain. Habits woman must have, but it is for her to choose what they shall be, provided she chooses quickly; the _time limit_ in habits is one of the strong evidences of the close connection of body and mind. It is a startling fact to face, that a woman’s habits are largely fixed before she is twenty; that the chief lines of her future growth and acquaintance before she is twenty-five; and her professional habits before she is thirty; yet to something like this James believes that physiologic psychology points. The woman becomes a bundle of habits, and her habits settle about her like a plaster cast. =The Physiology of the Brain and Nervous System.=—The brain, spinal cord, and spinal nerves constitute the so-called cerebrospinal nervous system. The brain is that portion of the nervous system which is contained within the cranial cavity and which it completely fills. The spinal cord is the continuation downward, from the brain through the spinal canal, of nerve substances, and from which the spinal nerves are given off. The nerves may be described as cords and threads of varying degrees of fineness, distributed to every tissue and organ in the body. The nervous system has been likened to the electric telegraph, the brain being the central station, while, in addition to the special senses, the body is provided with numerous terminal substations in the skin and internal organs of the body, which keep the brain informed of what is going on in the world around it, as well as in the various parts of the body. The nerves simply act as conductors to transmit the messages. The body is supplied with two distinct sets of nerves or wires, one of which carries messages from the outside world and various organs to the brain, while the other set transmits orders from the brain.