PHYSICAL CHARACTERS IN MAN 59 



be looked upon as a mutation following crossing. 

 Moreover, the spotting in man often follows a charac- 

 teristic pattern, beginning as a blaze in the forehead, 

 with spotting of the arms, the back largely black, 

 as well as the extremities. Curiously enough, photo- 

 graphs of the Honduras piebald (Pearson, 191 3) seem 

 to show^ an extension of some of the coloured spots as 

 the child develops. The sporadic manner in which 

 spotting appears in all such cases remains to be ac- 

 counted for. The Honduras piebald had five siblings,* 

 all normal mulattoes. His mother combined Mexican 

 and negro blood, W'hile the father was a pure negro. 



In an interesting case recorded by Dr. vSt annus 

 and cited in the monograph on albinism, piebaldism 

 was found to occur in five generations of a family of 

 natives at Florence Bay, Nyasaland, appearing in 

 nine individuals. Albinotic patches occurred in 

 the median line, on the anterior half of the scalp, 

 in the epigastric region, and broad " garters " about 

 the knees. The inheritance here extended to the 

 position of the patches. 



In an English family the inheritance of a white 

 forelock has been traced through six generations by 

 Harman {Trans. OphUiaf. Soc, 1909). The white 

 forelock is accompanied by a patch of white skin 

 spreading like a flare down the middle of the forehead. 

 In some members of the famih^ there are also patches 

 of pure w^hite skin on the median line of the trunk 

 or the inner sides of the calves. The eyes were normal, 

 with no white eyelashes or parti-coloured irides. 

 The members of the family are long-lived and robust, 

 but have a tendency to early w^hitening ot the hair. 

 This piebald marking was found in twenty-four 

 individuals belonging to nine childships among a 

 total of 138 individuals in the six generations. The 

 children of normals were all normal. In the first 

 * This term means brothers and sisters taken collectively. 



