Various, Encyclopaedia Britannica, 11th Edition…
“ Curiously enough, some of the tribes at one time considered lowest in point of general intellectual equipment have shown not a little of this ability, and there is a marked difference in this respect between tribes belonging to one and the same stock. The Athabaskan stock e.g. shows such variations, or rather perhaps this stock in general exhibits a tendency to adopt the culture of other peoples, thus some of the Athabaskan tribes in Alaska have acquired elements of culture from the Eskimo ”
