STUDIES IN HUMAN HEREDITY 317 



sho\ra to be hereditary they may be made to serve an important accessory 

 role in certaiii cases of disputed paternity. The pair of thumb-prints illus- 

 trated (of indi^^dual A) includes a left-hand hooked pattern (L) and a 

 right-hand cone pattern (R). The mother's thumb-prints are of similar 

 pattern, but reversed with respect to hands, i.e., the right thumb has the 

 hooked pattern and the left the cone pattern. The father's thumb-prints 

 are both of the cone type. A's -wife has both thumb-prints of the cone type. 

 Their only child, a girl of 14 months, has thumb-prints exactly like the 

 father (A) but again on the reverse hands, like her grandmother. 



