There has been this peculiarity. In certain parts of India, what is called inter-mixture and inter-mingling has been fairly considerable with the result that the process of absorption into the Hindu fold has been very great. On the other hand, in particular areas this has not been the case. There has however developed somehow a hostility between the ancient people and the new-comers. When the Aryan hordes came into this country, naturally they were unwelcome because they were intruders. But they began to pour in streams one after another and pushed the people that were there, the aboriginals, the Adivasis, further and further away. The Arya-speaking people settled in the rich Gangetic valley and ousted the Adivasis who had to retreat to the jungle fastnesses because the Aryas found them inhospitable. That is roughly the history as to why the Adivasis are today found only in the mountainous tracts, because these tracts were inhospitable, were inclement to the Aryan people.
