Proof of matters in reference to declaration of deceased person, or deposition

Where any declaration or statement made by a deceased person which is admissible in evidence, or any deposition, is proved, all matters may be proved in order to contradict it, or in order to impeach or confirm the credit of the person by whom it was made which might have been proved if that person had been called as a witness, and had denied upon cross-examination the truth of the matter suggested.