Invoking the Earth

[Win Than Tun]

>Dear Indologists,
>I would like to know the custom of invoking the earth (vasumdhara) as
>witness by pouring water when donations are made.  As this custom is found
also in connection
>with the donations made to non-Buddhist religions in India, I think it
originated
>with Brahmanism.
>If possible, I would like to know its origin and the legend connected with
>this custom.  I would also like to know whether there are any sculpture or
>painting in India representing the Earth Goddess (Vasumdhara).
>Sincerely,
>Win Than Tun
>