Indian Evidence Act, 1872
109. Burden of proof as to relationship in the cases of
partners, landlord and tenant, principal and agent
When the question is
whether persons are partners, landlord and tenant, or principal and agent, and
it has been shown that they have been acting as such, the burden of proving
that they do not stand, or have ceased to stand, to each other in those
relationships respectively, is on the person who affirms it.