The Kols of the Central Provinces have practically abandoned their
own language, Mundari being retained only by about 1000 persons in
1911. The Kols and Mundas now speak the Hindu vernacular current in
the tracts where they reside. Mundari, Santali, Korwa and Bhumij are
practically all forms of one language which Sir G. Grierson designates
as Kherwari. [556]