The dermatoglyphics of 100 mongol patients from Switzerland were investigated. The results are as follows:
1. Worls and arches are more scarce than in normal persons of the European races: 23.7% whorls, 1.0%. arches.
2. The very numerous loops (75.3% are frequently steep and narrow, the ridges tender or dissolved into pearls. Strong ridges often seem to be dismembered.
3. The ridges of the hands in the distal region want of swing and appear tightly stretched. The main line index (Cummins) reaches 10.15, the highest value so far found.
4. The patterns in the balls of the hands are much more numerous than in normal Europeans. The hypothenar pattern is sometimes extremely extended.
5. The axial triradius t”, rare in normal persons, is manifested in 80.0%.
6. The three and five-finger furrows are in nearly 60.0% changed and form more or less clear a four-finger or ape-furrow.
7. In spite of the distinctness of these characters it is not advisable to found the diagnosis of mongolism on them alone; clinical characters are necessary at all events.
6 pictures represent the various forms.