La Place says, in his “Essay on Probabilities,” that “any case, however apparently incredible, if it be a recurrent case, is as much entitled, under the laws of induction, to a fair valuation, as if it had been more probable beforehand.” Now, no one will deny that the case in question possesses this claim to investigation. Determined skeptics may, indeed, deny that there exists any well-authenticated instance of an apparition; but that, at present, can only be a mere matter of opinion; since many persons, as competent to judge as themselves, maintain the contrary; and in the meantime, I arraign their right to make this objection till they have qualified themselves to do so, by a long course of patient and honest inquiry; always remembering that every instance of error or imposition discovered and adduced, has no positive value whatever in the argument, but as regards that single instance; though it may enforce upon us the necessity of strong evidence and careful investigation. With respect to the evidence, past and present, I must be allowed here to remark on the extreme difficulty of producing it. Not to mention the acknowledged carelessness of observers and the alleged incapacity of persons to distinguish between reality and illusion, there is an exceeding shyness in most people, who, either have seen, or fancied they have seen, an apparition, to speak of it at all, except to some intimate friend; so that one gets most of the stories second-hand; while even those who are less chary of their communications, are imperative against their name and authority being given to the public. Besides this, there is a great tendency in most people, after the impression is over, to think they may have been deceived; and where there is no communication or other circumstance rendering this conviction impossible, it is not difficult to acquire it, or at least so much of it as leaves the case valueless. The seer is glad to find this refuge from the unpleasant feelings engendered; while surrounding friends, sometimes from genuine skepticism, and sometimes from good-nature, almost invariably lean to this explanation of the mystery. In consequence of these difficulties and those attending the very nature of the phenomena, I freely admit that the facts I shall adduce, as they now stand, can have no scientific value; they can not in short, enter into the region of science at all, still less into that of philosophy. Whatever conclusions we may be led to form, can not be founded on pure induction. We must confine ourselves wholly within the region of opinion; if we venture beyond which, we shall assuredly founder. In the beginning, all sciences have been but a collection of facts, afterward to be examined, compared, and weighed, by intelligent minds. To the vulgar, who do not see the universal law which governs the universe, everything out of the ordinary course of events, is a prodigy; but to the enlightened mind there are no prodigies; for it