Hutton believed that the earliest occupants of India were probably the Negrito race who, however, have left little trace in India. They are followed by the Proto-Austroloid. Next came an early branch of the Mediterranean race speaking an agglutinative tongue from which the present Austro-asiatic languages are derived. These are credited with a crude knowledge of agriculture and a megalithic cult. From Eastern Europe came a later wave of Mediterranean immigration, more advanced than the earlier hords, equipped with knowledge of metals and who developed the city states.