xv MAN 171 



grees at present available deal with characters which are 

 usually classed as abnormal. In some of these the in- 

 heritance is clearly Mendelian. One of the cases which 



FIG. 32. 



Normal and brachydactylous hands placed together for comparison. 

 (From Drink water.) 



has been most fully worked out is that of a deformity 

 known as brachydactyly. In brachydactylous people the 



