In a comprehensive paper, ninety pages long, Hinkle extends Jung's hypothesis of two broad psychological types, the introverted and extroverted, and suggests a further sub-division of each group into three, according to the degree of subjectivity or objectivity present. The conception is applied to the contrasts between nations, especially America and France. It is to be hoped that the account given of these nations is more accurate than the remarks on England: English readers will be astonished at, for instance, the statement, 'It is not chance that … instead of a mother country England should be referred to as father'.