From this table we can calculate that the pyramidalis absents in about 5-6% and presents in 95-94% in Japanese.If the percentage of the presence of the pyramidalis is compared with that of many races the following table is made : (from L o t h's table) From this table 1 can see that the percentage of the absence of the pyramidalis of Japanese is smaller than that of the other races.
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Masaru Mori (1964) studied this question.
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