Secondary evidence of writing in custody of adverse party.
Section 322
SEC. 322. Secondary evidence of writing in custody of adverse party. — If the writing be in the custody of the adverse party, he must have reasonable notice to produce it. If he then fail to do so, the contents of the writing may be proved as in the case of its loss. But the notice to produce it is not necessary where the writing is itself a notice, or where it has been wrongfully obtained or withheld by the adverse party.