5110 IV Cd.NFKlilvNCI'; INiKl;.N\ïl(l\AI,K lli; f.KNKTIUl K. 



'2" The abnormalily is liaiisiiiilli'd uiily l»\ lin' aliiiiiirii;ils. mikI iir\rr- Ipv llic 

 normals, so Ihat ail llic dcsccnilanis oi' normal'- air nuiiii:il. 



T)" Tlic ort'spring of parants, one ol' wlioiu is abiioriiial ( = (lumiiiaiil), Ihe 

 ()//((■/■ normal (^récessive) (the dominanl beine lielerozvaousl slionld tlieore- 



Fi-. i: 



lliiiiils iil'^irl afjed '.' yeiirs sluiwiiii; voi-y oiirlv uiiiiiii ni' E|ii|ili;sis in Isl ami lilllf liiiiçei-s 



lically show 50 7o «f each type. I'Ik- dcsiendanls in Ihis laniiiy, counling 

 only Ihose whose type is posilivcly knowii. amouiil lo i7, antl ol' Ihese 

 '21 are alinormals. This givcs fi/;"/,,"!' al)normals instead of Ihe Iheoroli- 

 cal M) Vo- 



But Ihis percenlage is noL lo bo rcgarded as posilivcly correcl. Il is certain 

 thaï il isas high as this, but not al ail cci-lain llial il does not still more closely 

 approximale lo the Iheorelical nnniber, and l'or Ihe simple reason thaï Ihe de'nl 

 is easily overlooked. When 1 lirsl inlei-vie\\<'(l Ihe woman N" !t in Ihe iliail 

 she informed me thaï ol" her len children only mic had short lingers lik<' lier 

 own, namely her eldest daugliler (N" l(i) A easnai inspection would hâve eon- 

 lirmed her slalement. The shorlening is so inconspicnons /)( ijoiin;/ r/uldrcn. 

 llial it is on/y delecled by /leximj tlic ///!;/('/.s, and liien llie shoiiened middle pha- 

 lanx is noliceable butnol olherwise. lis Ihis incans I \\:is :dilc lu show N"'.l lli.il 

 hertwoyoungest children's hands are of llif liracli\(lacl\ k)ii- lypc. and liiis i> 

 confirmed by the radiographs. In adulllil'e Ihe shorlnessof Ihe liand is conspi- 

 cnons enougli, and cannol be overlooked, bnl this is not so. dui-ing cliildhood, 

 and so it is possible thaï of Ihe lew i-hildren wliom 1 conld noi sec. and \\lio 

 werc declared lo be normal, om- orlwo niay bc ol Ihe aimornial lype and ilso 

 would inake the percentage of abnormals slill more cinsely a|)pro\imalc Ihe 

 Iheorelical 50 »/„. 



I hâve been able to oblain radiographs of Ihe hands ofiV~ 'j, 12, I i, 17. IS, 

 20, 21 and 22, and of Ihe feet of ail the same excepl N" ',). 



