Evidence how to be given and powers of Controller in respect thereof.

    Subject to any rules made in this behalf, in any proceeding under this Act before the Controller, evidence shall be given by affidavit in the absence of directions by the Controller to the contrary, but in any case in which the Controller thinks it right so to do, he may take oral evidence in lieu of, or in addition to, evidence by affidavit, or may allow any party to be cross-examined on the contents of his affidavit.