I would suggest, then, that the restriction of certain forms of spirits, if I may so call them, to certain localities, may be due to race intermixture.
"The Fairy-Faith in Celtic Countries"
W. Y. Evans Wentz
One cause of the change in public taste was the passion for more frivolous and coarser excitement, such as was afforded by the mimes and by gladiatorial combats and shows of wild beasts to a soldiery brutalised by constant wars, and to the civic masses degraded by idleness and by intermixture from all quarters of the world.
"The Roman Poets of the Republic"
W. Y. Sellar
For my own part, instead of discussing the relation of the Celts of Celtiberia to the other inhabitants of Spain, I would open a new question, and investigate the grounds upon which we believe in an intermixture at all.
"The Ethnology of the British Colonies and Dependencies"
Robert Gordon Latham