Who are the Untouchables and what is the origin of Untouchability? These are the main topics which it is sought to investigate and the results of which are contained in the following pages. Before launching upon the investigation it is necessary to deal with certain preliminary questions.

The first such question is : Are the Hindus the only people in the world who observe Untouchability?

The second is: If Untouchability is observed by Non-Hindus also how does untouchability among Hindus compare with Untouchability study has so far been attempted.