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This article discusses psychological types and changes with age. A considerable quantity of observations concerning retests, self and supplementary-estimates, psychiatric estimates, discrepancies; discrimination of the given estimate as relating to true inborn type or admired type or imagined type or overt type; ambivalence and overlying factors like emotions, all part and parcel of so-called clinical experience, have been discussed in a separate paper. One thousand subjects in age groups from 10 to 80 with equal incidence of each sex have been tabulated in various relations and reported in other papers. The persons observed were unselected, the questionnaire being offered wherever opportunity was found.