Institutio Oratoria

At times the character of the accused may be adduced to prove the fact, and to make it likely that it was or was not a case of poisoning because the accused is or is not a likely person to have committed such an act. When, on the other hand, the enquiry concerns both the accused and the act, the natural order for the accuser to pursue is to commence by proving that the act has been committed and then to go on to show that it was committed by the accused. If, however, proofs of the authorship of the crime are more in number than the proofs of the commission, this order may be reversed.