There has been during the week a loud and increasing demand for the application of the legal process of discovering truth to the Tilton-Beecher case. People ask that it be carried into court, not only because all witnesses might thus be compelled to appear and testify, but because apparently there is, in the minds of many, a peculiar virtue in "the rules of evidence" used by lawyers. Witnesses examined under these rules are supposed to receive from them a strong stimulus in veracity and explicitness, while they at once expose prevarication or concealment. One newspaper eulogist went so far the other day as to pronounce the rules the product of the wisdom of all ages, beginning with the Phoenicians and coming down to our own time. There is, however, only one good reason that we know of for carrying any attack on character into court, and that is the obvious one, that the courts only can compel those who are supposed to know anything about a matter of litigation to appear and state it. But we do not know of any other advantage which can be claimed for a trial in court, in such a case, over a trial before a well-selected lay tribunal. "The rules of evidence" in use in our courts are not, as too many persons seem to suppose, deductions from the constitution of the human mind, or, in other words, natural rules for the discovery of truth under all conditions. On the contrary, they are a system of artificial presumptions created for the use of a tribunal of a somewhat low order of intelligence, and are intended to produce certain well-defined and limited results, which the law considers generally beneficial. They have, that is to say, grown up for the use of the jury. The large number of exclusions which they contain are due simply to a desire to prevent jurymen's being confused by kinds of testimony which they are not supposed to have learning or acumen enough to weigh. If anyone will go into the City Hall and listen to the trial of even a trifling cause, he will find that the proceedings consist largely in the attempt of one lawyer to have certain facts laid before the jury and the attempts of the other to prevent it, the judge sitting as arbiter between them and applying the rules of admission and exclusion to each of these facts as it comes up. If he examines, too, in each instance what it is that is thus pertinaciously offered and pertinaciously opposed, he will find that it almost invariably has _something_ to do with the controversy before the court--it may be near or more remote--but still something. Consequently it has, logically, a certain bearing on the case, or is, under the constitution of the human mind, proper evidence. When the judge says it is irrelevant, he does not mean that it is logically irrelevant; he means that it has been declared irrelevant on certain grounds of expediency by the system of jurisprudence which he administers. He refuses to let it go to the jury because he thinks it would befog