"Aryan," a word that today evokes images of racial hatred and atrocity, was first used by Europeans to suggest bonds of kinship, as Thomas Trautmann shows in his far-reaching history of British Orientalism and the ethnology of India. When the historical relationship uniting Sanskrit with the languages of Europe was discovered, it seemed clear that Indians and Britons belonged to the same family. Thus the Indo-European or Aryan idea, based on the principle...