Map showing eye colour of schoolchildren, Germany 1875

From periodical series "Archiv für anthropologie : Zeitschrift für Naturgeschichte und Urgeschichte des Menschen" ('Archive for Anthropology: Journal of Natural History and Prehistory of the people') This section is entitled "Erhebung uber die Farbe der Augen, Haare und Haut der Schulkinder in Deutschland 1875" ('Survey on eye, hair and skin colour of German schoolchildren in 1875''). This particular map shows the shades of colour in brown-eyed schoolchildren in Germany in 1875. Volume XVI, between pp. 562-563