Prehistory and Protohistory in India and Pakistan c4.s23.2

c4.s23.2

However, it was never maintained by THOMSEN or his pupil WORSAAE that the concept of the Three Ages implied a straight forward evolution or development from one technological stage to another. They were aware of the breaks in development, as well as of the causes, such as invasion, diffusion of new ideas and migration of people which might have brought about new knowledge of copper and iron. It was NILSSON who declared the exact role of prehistoric archaeology. "It demonstrated that " he said, "notwithstanding apparent or partial retrogression the human race was constantly undergoing a gradual and progressive development."