examination of documents should never be confused with the results obtained by reasoning. When we state a fact known to us by reasoning only, we must not allow it to be supposed that we have found it in the documents; we must disclose the method by which we have obtained it.
(3) Unconscious reasoning must never be allowed; there are too many chances of error. It will be enough to make a point of putting every argument into logical form; in the case of bad reasoning the major premiss is generally monstrous to an appalling degree.
(4) If the reasoning leaves the least doubt, no attempt must be made to draw a conclusion; the point treated must be left in the conjectural stage, clearly distinguished from the definitively established results.
(5) It is not permissible to return to a conjecture and endeavour to transform it into a certainty. Here the first impression is most likely to be right. By reflection upon a conjecture we familiarise ourselves with it, and end by thinking it better established; while the truth is, we are merely more accustomed to it. This is a frequent mishap with those who devote themselves to long meditation on a small number of texts.
There are two ways of employing reasoning, one negative, the other positive; we shall examine them separately.
II. The negative mode of reasoning, called also the "argument from silence," is based on the absence of indications with regard to a fact. From the circumstance of the fact not being mentioned in any document it is inferred that there was no such fact; the argument is applied to all kinds of subjects, usages of every description, evolutions, events. It rests on a feeling