In taking up the thesis, The Thirteenth the Greatest of Centuries, it seems absolutely necessary to define just what is meant by the term great, in its application to a period. An historical epoch, most people would concede at once, is really great just in proportion to the happiness which it provides for the largest possible number of humanity. That period is greatest that has done most to make men happy. Happiness consists in the opportunity to express whatever is best in us, and above all to find utterance for whatever is individual. An essential element in it is the opportunity to develop and apply the intellectual faculties, whether this be of purely artistic or of thoroughly practical character. For such happiness the opportunity to rise above one's original station is one of the necessary requisites. Out of these opportunities there comes such contentment as is possible to man in the imperfect existence that is his under present conditions. Almost as important a quality in any epoch that is to be considered supremely great, is the difference between the condition of men at the beginning of it and at its conclusion. The period that represents most progress, even though at the end uplift should not have reached a degree equal to subsequent periods, must be considered as having best accomplished its duty to the race. For purposes of comparison it is the amount of ground actually covered in a definite time, rather than the comparative position at the end of it, that deserves to be taken into account. This would seem to be a sort of hedging, as if the terms of the comparison of the Thirteenth with other centuries were to be made more favorable by the establishment of different standards. There is, however, no need of any such makeshift in order to establish the actual supremacy of the Thirteenth Century, since it can well afford to be estimated on its own merits alone, and without any allowances because of the stage of cultural development at which it occurred.