Heredity of skin color in negro-white crosses
This 1913 Carnegie Institution of Washington publication by geneticist Charles Benedict Davenport studies inherited skin color in families of mixed Black and white ancestry, written for scientific readers. Its pictures are pencil sketches of faces with blanked-out features, arranged in genealogical rows labelled with pedigree codes such as II,1 and III,8 and (M) for male. A designer could take from them the orderly grid of rows and small labels used to chart family trees, with the faces left as neutral blank silhouettes.
