[Pramāṇa](https://indike.org/pramana/) › [Studies](https://indike.org/pramana/ins) › [Science, technology and education](https://indike.org/pramana/ins.science) › [History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray](https://indike.org/pramana/ins.science.ray-1956) › c13.2 # History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c13.2 History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c13.2 - **Language:** English ### [c13.2](https://indike.org/pramana/ins.science.ray-1956.c13.2) The great urban civilization of the Indus Valley and the earlier agricultural communities of the Baluchistan hills had an almost uninterrupted duration for seven to eight hundred years. There is evidence according to Piggott that the Baluchi settlements and the great cities of the Harappan Kingdom were then sacked and burnt by the barbarian invaders from the west. Refugees from these invaded sites migrated towards the east and made temporary settlements on the Gangetic Plains and the hilly regions to the south-east. This happened probably after 2000 B.C. but before 1500 B.C. - [Previous: c13.1](https://indike.org/pramana/ins.science.ray-1956.c13.1) - [Next: c13.3](https://indike.org/pramana/ins.science.ray-1956.c13.3) - [Up: c13](https://indike.org/pramana/ins.science.ray-1956.c13) --- Source: [https://indike.org/pramana/ins.science.ray-1956.c13.2](https://indike.org/pramana/ins.science.ray-1956.c13.2) · Pramāṇa