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mortem report of the doctor is his previous statement based on his examination of the dead body. It is not substantive evidence. The doctor's statement in court is alone the substantive evidence. The post-mortem report can be used only to corroborate his statement under Section 157, or to refresh his memory under Section 159, or to contradict his statement in the witness box under Section 145 of the Evidence Act, 1872. A medical witness called in as an expert to assist the court is not a witness of fact and the evidence given by the medical officer is really of an advisory character given on the basis of the symptoms found on examination. The expert witness is expected to put before the court all materials inclusive of the data which induced him to come to the conclusion and enlighten the court on the technical aspect of the case by explaining the terms of science so that the court although, not an expert may form its own judgment on those materials after giving due regard to the expert's opinion because once the expert's opinion is accepted, it is not the opinion of the medical officer but of the court.