It is this which adapts us to different situations, different groups, by calling into play organized modes of talking or acting. We pass from a group of ladies in whose presence we have been friendly but decorous, perhaps unconventionally formal, to a group of business intimates, men of long acquaintance. Without even being conscious of it we lounge around, feet on the table, carelessly dropping cigarette ash to the floor, using language chosen for force rather than elegance; we discuss sports, women, business and a whole group of different emotions, habits and purposes come to the surface, though we were not at all conscious of having repressed them while in the presence of the ladies. A faux pas is where the organizer has "slipped" on his job; lack of tact implies in part a rigid organizing energy, neither plastic nor versatile enough. We are now ready to face certain developments of these three main factors, viz., the response to stimuli; choice and inhibition, and the organizing energy. Largely we might classify people according to the type of vigor of their reactions to stimuli, the quality and vigor of choice and of inhibition, and the quality and vigor of the organizing energy. We note that there are people who have, as it were, exquisitely sensitive feelers for the stimuli of one kind or another and who react vigorously, perhaps excessively; that there are others of a duller, less reactive nature, largely because they are stimuli-proof. Others are under-inhibited, follow desire or outer stimulus without heed, without a brake; others are over-inhibited, too cautious, too full of doubt, unable to choose the reaction that seems appropriate. The organizing energy of some is low; they never seem to unify their experiences into a code of life and living; they are like a string of beads loosely strung together with disharmonious emotions, desires, purposes. In others this energy is high, they chew the cud of every experience and (to change the metaphor) they weld life's happenings, their memories, their emotions and purposes into a more unified ego, a real I, harmonious, self-enlightened; clearly conscious of aim and end and striving bravely towards it. Or there is over-unification and fanaticism, with narrow aim and little sympathy for other aims. Sketched in this very broad way we see masses of people, rather than individuals, and we are not finely adjusted to our subject.