Ar`yans, or Indo-Europeans, a race that is presumed to have had its primitive seat in Central Asia, E. of the Caspian Sea and N. of the Hindu-Kush, and to have branched off at different periods north-westward and westward into Europe, and southward into Persia and the valley of the Ganges, from which sprung the Greeks, Latins, Celts, Teutons, Slavs, on the one hand, and the Persians and Hindus on the other, a community of origin that is attested by the comparative study of their respective languages.