ethnology
n.
"science of the characteristics, history, and customs of the races of mankind," 1832, from ethno- + -logy, perhaps modeled on French or German. Related: Ethnologist; ethnological.
Ethnology is a very modern science, even later than Geology, and as yet hardly known in America, although much cultivated latterly in Germany and France, being considered an indispensable auxiliary to history and geography. ["Atlantic Journal and Friend of Knowledge," Philadelphia, summer 1832]