XII] 



Mendelian Heredity in Man 



207 



hitherto been compiled. Two such cases may be given. 

 The first is that of a pecuHar form of short woolly hair, 

 resembling that of the negro (Gossage (132), on the 



Cfx J 



Cf X f 



y 



Q> 



Fig. 21. Descent of a peculiar form of curly hair recorded by Dr Walter 

 Bell. (After Gossage, 132.) The black symbols are the affected 

 members. 



authority of Dr Walter Bell). Family tradition attributed 

 this peculiarity to a "Mexican" ancestor several generations 

 back. The peculiarity was transmitted directly through 

 those who exhibited it, as shown in the diagram (Fig. 21). 



The second is a similar inheritance of a lock of congeni- 

 tally white hair recorded by Rizzoli, which clearly behaved 

 as an ordinary dominant (see Fig. 22). 



\ 



X. 



* • 



hbb 



I I I I 



0«0»#0#000(5)® 

 Fig. 22. 



I 



rr 



o#o •o»o« 



G O 



Descent of a congenital lock of white hair, recorded by 

 Rizzoli. (After Gossage, 132.) 



There can be little doubt that if pains were taken to 

 record the descents of striking features many such pedigrees 

 could be compiled. It is of course necessary, if oral testi- 



