406 



W. Batesoll. 



with some frequency' among the offspring of consanguineous marriages 

 — a circumstance characteristic of recessive features ; but the existence 

 of complications is indicated both bj- the many degress in which 

 human albinism ma}^ present itself, and by the frequent association 

 of the peculiarity with various forms of disease — an association not 



Fig. 21. Pedigree of Farabee"s family from his paper i. N, normal: A, abnormal, 

 with oulj' two phalanges in tiugeis and toe.s. 



<^ ^ é 6 c^ T T Î 



? 7 ? 



T 



S 



? 



^ ? ! T <? T 



LJ L^i J^ 1 



Fig. 22. Offspring of abnormal members of Farabee's family' (from his paper i 

 The black symbols indicate the affected. 



usual among domesticated animals. The inheritance of this peculiaritj" 

 in Man in probably Mendelian, but it may be not so simple as in 

 the other animals. 



The condition known as alkaptonuria studied by Gar rod (56) 

 is probably a recessive character, as indicated by the high proportion 

 of cases of this rare condition resulting from first-cousin marriages. 



