其他摘要：This paper was intended to observe briefly one of the important problems in the study of physical education, a problem of differentiation and integration, by taking up a specific case of study as a reference. Firstly a man as an object of study in physical education was discussed from the viewpoints of philosophically categorized academic disciplines, in that differences of a man as a natural being viewed from scientific operations and as a human being as of the subject of behavior were clarified. Secondly, by taking up a specific case of study as a reference, a blunting trend of an angle of the front edge of the cross-sectional circumference of the central part of a shin (tibia) of men from the New Stone Age to the present was examined from the view of the findings of natural anthropology. It was the present author's new findings that when comparison was made on the measurements taken for modern men by the use of an ultrasonic wave method the angle of the front edge of the shin of a man with high motor ability was smaller than that of the ordinary man and that the former showed a flat "tibia". Lastly, based on the above mentioned facts, the necessity for the synthesis of the science of humanity and social science with natural science was maintained in order to utilize the latter in physical education and possible directions for the solution of the integration problem were suggested.
