In Eysenck's latest monograph, his well-known contributions to conditioned reflex and learning theory are reformulated and extended with the aim of providing a scientific, experimentally determined basis of a general theory of behavior. Scientific excursions of this kind in the direction of an ultimate formula for human behavior are rarely without points of interest to specialists in similar or related fields, especially so in this instance because the working concepts known to everyone dealing with varieties of normal and abnormal behavior here presumably become the subject of experimental test and scrutiny. One may judge, on the basis of this precisely formulated and detailed account, the success with which the author and his associates control the familiar variables, as defined by them, of inhibition, drive, and anxiety in human subjects. Utilizing his own modification of Hull's universal formula for behavior1,