178 HEREDITY IN RELATION TO EUGENICS 



is apparently inherited like double jointedness. Another 

 case of family deformity of the digits is given by Carson 

 (Keating's Ency. Ill, 935). Here there is an absence of the 



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iqioiJi 4ia IjO 



deformed 

 lianda 



'ikoU66iM^ 



N 



Fig. 161. — Pedigree of family with double jointed hands, all joints thick, 

 ring and little fingers crooked from the distal joint. Affected persons marked 

 by black symbols. Dobell. 



distal phalanx and part of the median phalanx from all 

 fingers of both hands, the thumbs being normal. Here 

 again the defect had not skipped a generation, i. e., was not 

 transmitted by normals. It has been known in the family 



i 



? 



DtO 





Fig. 162. — Pedigree of tendency of great toe to grow under others (black 

 symbols represent affected persons). F. R.; Ov. 



for over a century. Foot (Difformites des Doigts, p. 80) tells 

 of a famil}^ in which for three generations the peculiarity has 

 appeared of possessing only the fifth finger. The second and 

 third fingers are represented in these individuals by the 



