2l6 



split Hand 



[CH. 



in different individuals. The pedigree shows that this con- 

 dition descended through the affected in four generations, 

 but the descendants of the unaffected are not recorded. 

 According to this table the families of the affected add up to 

 Affected 8 ; Unaffected 15 ; not known 2. 



A correspondent has sent me a pedigree of a family in 

 which the fingers were almost entirely aborted. The descent 

 was that of an ordinary dominant. The families of the 

 affected add up to 19 affected and 16 unaffected. The 

 children of the unaffected were normal in all cases. 



The condition known as "split hand" and ** split foot," 

 in which these extremities have a monstrous, claw-like 



9 



mZTH"!-^;? 



Fig. 29. Descent of prae-senile cataract. (Condensed from Nettleship's 



chart.) 



appearance also descends as a dominant"^. Partial suppres- 

 sion of the digits is one of the features of this abnormality. 

 The degree of malformation varies greatly among the 

 affected individuals of the same family, and though there is 

 generally a rough correspondence between the two hands 

 and the two feet of the same person the symmetry is only 

 partial. 



A considerable list of abnormalities following a course 

 of heredity similar to that of the short digits can now be 

 given. Of these a few only are mentioned here. 



* For full collection of evidence see Lewis, T., and Embleton, D. (170). 



