Feelings of irritation follow as a result of the thwarting of some desire or mental attitude and are consequently predetermined by the attitude of the moment. From this, anger develops for the most part, as a result of a series of stimuli, which have a cumulative effect. Each thwarting of the impulse intensifies the irritation until anger is developed. One or two failures may stimulate unpleasant feelings, which at the time are ignored; but with an increase of the number of stimuli, there is an accumulative effect in which the awareness of the previous failures becomes more intense than at the moment when they occurred. The following from B.’s observations will illustrate, “I was writing a letter to an important personage and was making special effort to write it neatly. I made an error and felt unpleasantly irritated. Still feeling quite unpleasant, I turned to look for my eraser and could not find it. I looked in several places. Each failure was followed by a sudden increase in intensity of unpleasant feelings.” Finally B. found himself using defamatory language prolifically, giving expression to a rather well developed case of anger. One is usually aware in anger of this type, that the emotion is the cumulative effect of a number of previous stimuli. It appears from the reports, that if the mental predisposition is intense enough, one or two failures may suffice to excite anger. In general the stronger the predisposition, the less number of failures is required before anger is fully developed.