It seems strange to find a writer so regardless of what is, in these days, considered the first canon of historical inquiry, that evidence worth having must be almost entirely the evidence of contemporaries who are in a position to know something about that which they assert. It is true that this canon must not be received pedantically. Tradition is worth something, at all events when it is not too far removed from its source. If a man whose character for truthfulness stands high, tells me that his father, also believed to be truthful, seriously informed him that he had seen a certain thing happen, I should be much more likely to believe that it was so than if a person, whom I knew to be untruthful, informed me that he had himself witnessed something at the present day. The historian is not bound, as the lawyer is, to reject hearsay evidence, because it is his business to ascertain the truth of individual assertions, whilst the lawyer has to think of the bearing of the evidence not merely on the case of the prisoner in the dock, but on an unrestricted number of possible prisoners, many of whom would be unjustly condemned if hearsay evidence were admitted. The historian is, however, bound to remember that evidence grows weaker with each link of the chain. The injunction, "Always leave a story better than you found it," is in accordance with the facts of human nature. Each reporter inevitably accentuates the side of the narrative which strikes his fancy, and drops some other part which interests him less. The rule laid down by the late Mr. Spedding, "When a thing is asserted as a fact, always ask who first reported it, and what means he had of knowing the truth," is an admirable corrective of loose traditional stories. A further test has to be applied by each investigator for himself. When we have ascertained, as far as possible, on what evidence our knowledge of an alleged fact rests, we have to consider the inherent probability of the allegation. Is the statement about it in accordance with the general workings of human nature, or with the particular working of the nature of the persons to whom the action in question is ascribed? Father Gerard, for instance, lavishly employs this test. Again and again he tells us that such and such a statement is incredible, because, amongst other reasons, the people about whom it was made could not possibly have acted in the way ascribed to them. If I say in any of these cases that it appears to me probable that they did so act, it is merely one individual opinion against another. There is no mathematical certainty on either side. All we can respectively do is to set forth the reasons which incline us to one opinion or another, and leave the matter to others to judge as they see fit.