None of them have adopted a Dravidian language, but all speak corrupt forms of the ancient Aryan vernaculars derived from Sanskrit.

The fact seems to indicate that at the time when they abandoned their own languages these tribes were in contact with Hindus, and were not surrounded by Gonds, as several of them are at present.

The history of the Central Provinces affords considerable support to the view that the Gond immigration occurred at a comparatively late period, perhaps in the ninth or tenth century, or even later, after a considerable part of the Province had been governed for some centuries by Rajput dynasties.

[76] The Gonds and Oraons still have well-defined legends about their immigration, which would scarcely be the case if it had occurred twenty centuries or more ago.
Any further evidence or argument as to the date of the Dravidian immigration would be of considerable interest.
40.

Origin of the impure castes.
The fifth or lowest group in the scheme of precedence is that of the impure castes who cannot be touched.