This concludes my general rules on this subject. We will now proceed to consider the several parts of forensic cases, and although I cannot follow them to the ultimate species, cp. VI. i. 23. that is to say, I cannot deal with individual suits and controversies, I shall be able to discuss them on general lines in such a way as to show what bases most of them involve. And since the first question naturally is whether an alleged fact has taken place, I will begin with this.