摘要：The thickness of hair being with a certain characteristic in each individual, an attempt was made to represent such characteristic by numerical value. No significant differences were found of the maximum diameter of hair in cross section among the frontal, parietal and occipital regions.The maximum diameter of parietal hair at its base showed no significant difference from that at the ending, but the minimum diameter of the former proved larger than the latter. It was disclosed that the base of parietal hair was more round than the ending of it.Stress was given that the extent and variation of sampling error be carefully considered in representing the maximum diameter of hair of individuals in cross section by arithmetic mean.It was concluded that an adequate numerical value which represents the thickness of hair in individuals should be obtained by an arithmetic mean of muximum diameter on cross secion of parietal hair growing about 1-2cm from the hair border on the basis of 20-40 hair samples.
