The declaration of the accused, the formal parts of which may be written or printed, or partly written and partly printed, duly authenticated by a justice as having been emitted before him according to the existing law and practice, shall be received in evidence without being sworn to by witnesses, and it shall not be necessary to insert the names of any witnesses to the declaration in any list of witnesses, either for the prosecution or for the defence.

It shall be competent for the defence, before such declaration is read to the jury, to adduce as witnesses the persons who were present when the declaration was emitted, and to examine them upon any matters regarding such declaration on which it would be competent to examine them according to the existing law and practice, and to move the court to refuse to allow the declaration to be read on grounds appearing on the face of the declaration itself, or on the ground of what is disclosed in such evidence or on both of these grounds, and where the defence objects to the declaration, the prosecutor shall be entitled to examine any witnesses in regard thereto, whom the defence may be entitled to examine as aforesaid.