10.-(1) Biddings by an agent shall be supported by-
(a) the written authority of the principal for the agent to act in his behalf; or
(b) the written statement of the agent declaring that the bidding was made on behalf of the principal named in the statement, to be furnished to the auctioneer at the close of the sale, when transfer of the property sold may be made direct to the principal:
Provided, however, that if the principal fails to comply with the conditions of rule 11, the agent shall be held to be the highest bidder.
(2) Biddings for minors shall be made by their natural guardians or by a person duly authorized by the District Court, or, in case of Moslems, by the Turkish Family Court.