1. The author has worked out a new systematics for the interdigital patterns of the palm based on the building up of digital triradius 3 and the extension of main line C with the following types of pattern as result: U (ulnar loops), R (radial loops), O (open-field pattern) and V (vestiges — incomplete patterns or “special” patterns).
2. A significant difference in frequency for the pattern distribution between the two hands has been found for U, R as well as for O-patterns (U-patterns and O-patterns appear with 6.5 respectively 14.3% higher frequency on the left hand, while R-patterns appear with 20.2% higher frequency on the right hand.).
3. The pattern distribution does not show any difference between the two sexes.
4. Calculations of correlations in tetrachoric tables have shown a strong mother-child correlation on the 99.9% level for U-pattern set against R-pattern for both the right and the left hand (r = 0.39-0.43).