Turning now to the symptoms of the stupor proper, we note, first, the effects of the loss of energy which regression implies. The inactivity and apathy which these patients show is too obviously evidence of this to require further comment. Another proof of the withdrawal of the libido or interest is found in the thinking disorder. Directed, accurate thinking requires effort, as we all know from the experience of our laborious mistakes when fatigued. So in stupor there is an inability to perform simple arithmetical problems, poor orientation is observed, and so on. Similarly what we remember seems to be that which we associate with the impressions received by an active consciousness. Actual events persist in memory better than those of fancy, in proof of which one thinks at once of the vanishing of dreams on waking, with its reëstablishment of extroverted consciousness. This registration of impressions requires interest and active attention. Without interest there is no attention and no registration. The patient in stupor presents just the memory defect which we would expect. Indifference to his environment leads to a poor memory of external events, while on recovery there may be such a divorce between consciousness of normal and abnormal states that the past delusions are wiped from the record of conscious memory. Withdrawal of energy then produces not only inactivity and apathy but grave defects in intellectual capacity. The natural flow of interest in regression is to earlier types of ambition and activity. This is betrayed not merely by the thought content dealing with the youth and childhood of the patient, but also is manifested in behavior. Excluding involution melancholia there is probably no psychosis in which the patients exhibit such infantile reactions as in stupor. Except for the stature and obvious age of these patients, one could easily imagine that he was dealing with a spoiled and fractious infant. One thinks at once of the negativism which is so like that of a perverse child and of the unconventional, personal habits to which these patients cling so stubbornly. Masturbation, for instance, is quite frequent, while willful wetting and soiling is still more common. We sometimes meet with childishness, both in vocabulary and mode of expression. In one case there was evidently a delusion of a return to actual childhood, for she kept insisting that she was “in papa’s house.”