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For several years the author has been studying on the positional development of the dental germs i. e. the process of the topographic changes of tooth germs to each other as well as to the dental arch as a whole. The first paper on this subject was published in 1956 dealing with the front tooth germs. In this paper it was observed that each tooth germ has a characteristic growth direction from the very beginning of its development resulting in the zigzag arrangement of the front tooth germs which can be clearly observed in the latter half of the fetal life. Then, in the third report in 1959 it was stated that in the very early stages the molar germs have also their characteristic growth pattern with conspicuous spacing between them. The author, subsequently, traced the developmental process of the molar germs in the later fetal period and found that crowding of the germs takes place as the germs grow, just in the similar way to that of the front teeth. This process will be described in details in the first and second part of the present paper. At the same time he studied the further changes in the relative topography of the front teeth, especially the vertical relationship between adjacent teeth in the latter half of the fetal life. These points are dealt with in the third part of this report.