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Pedigrees of Negro families are apparently about the same as for those of any other racial group. Only one disease, sicklemia, seems to be characteristic of Negroes. The normal traits discussed are also much the same as those for white folks except that musical ability appears to be commoner and more remarkable among Negroes. This is well discussed in chapter 7, and several convincing family trees are given as evidence. Left handedness and ambidexterity are considered and charts are shown, but no conclusion is drawn as to what the type of inheritance may be. The author's statement, "It is known that in right handed persons the sulcus lunatus... is on the left side" would not be accepted by many. Nor would his statement that "stuttering probably arises only when a change from left to right as the functionally active hand is forced on the child too early" be acceptable to
Pedigrees of Negro Families. AMA Arch NeurPsych. 1951;65(4):542-543. doi:10.1001/archneurpsyc.1951.02320040132017