Slide showing a table illustrating 'the nature of interracial differences'. Slide shows a table illustrating 'the nature of interracial differences'. Row headings: 'characters', 'absolute or statistical difference', 'many or few genes', 'influence of nurture' and 'selective value'. Column headings: 'characters': 'colour and hair form', 'skeletal characters', 'serological characters' and 'psychological characters'. The table is titled 'table 8.' Late 19th to early 20th century