It is said in the ninth book of the Morals of Aristotle, It is better to come at the probable knowledge of some things above us in the heavens, than to be capable of giving many demonstrations relating to things here below. This is no doubt an admirable proposition, and speaks the lofty aims of that sublime mind from whence it proceeded. Among all the disquisitions in this kind, none seem to me more excellent than those which treat concerning the genii that attend upon men, and guide them in the actions of life. A genius, or demon, of the good kind, is a sort of mediate being, between human and divine, which gives the mind of man a pleasant conjunction with angelic and celestial faculties, and brings down to earth a faint participation of the joys of heaven. That there have been such fortunate attendants upon wise men, we have many rare instances. They have been ascribed to Socrates, Aristotle, Plotinus, Porphyrius, Iamblicus, Chicus, Scaliger, and Cardan. The most celebrated of all these ancients, was Socrates; and as for his having a genius, or demon, we have the testimonies of Plato, Xenophon, and Antisthenes, his contemporaries, confirmed by Laertius, Plutarch, Maximus Tyrius, Dion Chrysostomus, Cicero, Apuleius, Ficinus, and others; many of the moderns, besides Tertullian, Origen, Clemens Alexandrinus, Austin, and others; and Socrates himself, in Plato's Theage, says, By some divine lot I have a certain demon which has followed me from my childhood as an oracle; and in the same place intimates that the way he gained his instruction, was by hearing the demon's voice. Nothing is certainly so easy as for men to be able to contradict things, though never so well attested, with such an air of truth as to make the truth of the history doubted by others as well as themselves, where no demonstrative proof can be brought to convince them. This has been the easy task of those who object against the demon of Socrates; but when no demonstrative proof is to be had on either side, does not wisdom incline us to lean to the most probable? Let us then consider whether the evidences are not more credible, and witnesses of such a thing are not persons of more authority than these men are, who vouchsafe to give no reason but their own incredulity, for maintaining the contrary, and whether those, therefore, by the right rule of judging, ought not much sooner than these, to gain over our assent to their assertions? We will, however, laying aside the histories of those ancient times, the sense whereof, by various readings and interpretations being put upon the words, is rendered obscure and almost unintelligible, descend to more modern relations, the facts whereof shall be placed beyond doubt, by reason of the evidences we will bring to attest them, and shall consequently prove the perception men have of spirits, or genii, by every sense. SECTION I. We will first begin as to the perception of spirits by the sight.