According to his theories, the mixed populations of Spain, most of France and Italy, most of Southern Germany, most of Switzerland and Austria, and parts of Britain derived from the historical development of the Roman, Greek, and Ottoman empires, which had brought the non-Aryan peoples of Africa and the Mediterranean cultures to western and northern Europe. He believed the populations of southern and western Iran, southern Spain and Italy consisted of a degenerative race arising from miscegenation, and the whole of north India consisted of a "yellow" (Asian) race.