Krapf deals with the psychological implications of medicine from the point of view of 'personalistic psychology'. After preliminary considerations concerning the impossibility of studying mental and somatic processes separately, he examines in some detail the social aspect of physical disease and the mental conflicts aroused by being sick. He discusses the influence of emotions on physical functions and shows that neurotic conflicts express themselves in functional disorders and structural alterations. Finally he quotes the principal findings of psychosomatic research in hypertension, asthma, gastric ulcer and accident habit.