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L. Penrose (1954)
THE DISTAL TRIRADIUS t ON THE HANDS OF PARENTS AND SIBS OP MONGOL IMBECILESAnnals of Human Genetics, 19
(1951)
Racial differences in palm-print ridge counts. The a-b ridge count in the OntarioFISHER
(1954)
Statistical Methoda for Research Worker8, 12th ed
(1954)
The distal triradius t on the hands of parents and sibs of mongo1 imbeciles. Ann. British, European Jews and Ontario-Indians
T. Fang (1951)
RACIAL DIFFERENCES IN PALM-PRINT RIDGE COUNTSThe a-b Ridge Count in the Ontario-British, European Jews and Ontario-IndiansJournal of Heredity, 42
(1951)
Racial differences in palm-print ridge counts. The a-b ridge count in the Ontario
BY JOSE PONS Catedrcitico de Antropologia, Facultad de Ciencias, Universidad de Oviedo, Oviedo (Spain) In the analysis of the morphology of epidermal ridges the 'deltas ' or 'triradii ' appear as very important elements. A triradius can be defined as the meeting point of three ridges called radiants. On the palm there are normally four triradii, one at the base of each finger, called u, b, c and d, beginning with the one under the index finger, and another triradius known as t near the base of the fourth metacarpal bone or at some point on its axis. The study of the degree of separation between tritadii can supply interesting data on ridge configuration. The number of ridges between two triradii seems a suitable measure of this separation for it is independent of hand size. This is specially important in the present paper which involves parent-child comparisons with significant differences in hand sizes. For this reason, the direct measurement is obviously unsuitable, since it is not easy to find an appropriate correction factor for the varying hand sizes. Further, we must not forget another possible source of error, namely, that due to the variability in pressure and in
Annals of Human Genetics – Wiley
Published: Mar 1, 1963
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