84 HEREDITY AND EUGENICS 



or possibly on account of it. Bateson, who discussed 

 the earher records of brachydactyly (1909, p. 210), 

 refers to a four-generation pedigree, described by 

 Walker, of what appears to be a mild form of minor- 

 brachydactyly inherited in the same way. 



Lewis (1909c), in a thesaurus of the results of the 

 study of brachydactyly, up to the time his paper 

 appeared, cites two other cases with interesting 



Fig. 15. — Hand showing Abnormal Segmentation op' the 

 Index and Middle Fingers. (After Drinkwater.) 



features. In Mercier's case a French family is 

 described in which eighteen members in three 

 generations are brachydactyl, having two phalanges 

 on all the fingers and toes. Hasselwander's case 

 (a German family) presents a feature of special 

 interest. There w^ere six abnormal members of the 

 family in three generations. The original brachy- 

 dactyl of this pedigree came from normal parents. 

 His advent must, then, mark an independent origin of 



