form of a systematic learning theory;29 more recently efforts havebeen made to apply these concepts to the neuroses, based on thecontention that such phenomena are the results of faulty learning.During the past ten years, laboratory methods have been appliedmore intensively and rigorously to the investigation of the relation-ship between feeling and emotions and changing visceral activity.Finally, many early observers and investigators had studied therelationship between mental stress and the development of disordersin various parts of the body.30