1. This feeling is excited by the society of others, by the herd-feeling, and depressed by long-continued solitude or loneliness. The stimuli that come from other people's faces, voices, contacts--their emotions, feelings and manifestations of energy--are those we are best adapted to react to, those most valuable in stirring us up. Scenery, the grandeur of the outer world, finally depress the most of us, and we can bear these things best in company. Who has not, on a long railroad journey, watched with weariness and flickering interest valley and hill and meadow swing by and then sat up with energy and definite attention as a human being passed along on some rural road? Lacking these stimuli there is monotony and monotony always has with it as one of its painful features a subjective sense of lowered energy, of fatigue. This is the problem of the housewife and the solitary worker everywhere,--there is failure of the sense of energy due to a failure to receive new stimuli in their most potent form, our fellows. 2. The disappearance or injury of desire and purpose. Let there be a sudden blocking of a purpose or an aim, so that it seems impossible of fulfillment, and energy-feeling drops; movement, thought, even feeling seem painful. The will flags, and the whole world becomes unreal. This is part of the anhedonia we spoke of. In reality, we have the disappearance of hope as basic in this adynamia. Hope and courage are in part organic, in part are due to the belief that a desired goal can be reached. Whether that goal is health, when one is sick, or riches, or fame, or love and possession, if it is a well-centralized goal toward which our main energies are bent, and then seems suddenly impossible to reach, there is a corresponding paralysis of energy. Here is where a great difference is seen between individuals and between one time of life and another. There are some to whom hope is a shining beacon light never absent; whatever happens, hope remains, like the beautiful fable of Pandora's box. There are others to whom any obstruction, any discouraging feature, blots out hope, and who constantly need the energy of others; their persuasions and exhortations, for a renewal of energy. Here, as elsewhere in life, some are givers and others takers of energy. In the presence of the hopeless it is hard to maintain one's own feeling of energy and that is why the average man shuns them. He guards as priceless his own enthusiasm.