I have no acquaintance either with P or Q. But I feel sure that the decided conviction of all who can see both sides of the shield must be, that it is more likely that P has seen a ghost than that Q knows he cannot have seen one. I know that Q says he knows it.
In this connexion the following from the Publishers' Circular on the appearance of Mrs. De Morgan's book shows a contemporary estimate of Professor De Morgan's critical faculty:
Mere LITTERATEURS and writers of fiction may be pardoned for a little tendency to the visionary and unreal, but the fact that the well-known author of the standard works on Formal Logic, the Differential Calculus, and the Theory of Probabilities, should figure with his lady in the characters of believers in spirit-rapping and table-turning, will probably take most people by surprise. There is perhaps no contributor to our reviews who is more at home in demolishing a fallacy, or in good-humouredly disposing of an ignorant pretender in science than Mr. De Morgan. His clear, logical, witty and whimsical style is readily traced by literary readers in many a striking article in our critical journals. He is probably the last man whom the sceptical in such mysteries would expect to find on the side of Mr. Home and Mrs. Newton Crosland. Yet we must record the fact that Mr. De Morgan declares himself " perfectly convinced that he has both seen and heard, in a manner which should make unbelief impossible, things called spiritual which cannot be taken by a rational being to be capable of explanation by imposture, coincidence, or mistake."
Let us add to the foregoing Mrs. De Morgan's testimony:
It is now ten years since I began attentively to observe the phenomena of "Spiritualism." My first experience occurred in the presence of Mrs. Hayden from New York. I never heard a word which could shake my strong conviction of Mrs. Hayden's honesty; indeed, the result of our first interview, when my name was quite unknown to her, was sufficient to prove that I was not on that occasion the victim of her imposture, or my own credulity.
After describing the visit to Mrs. Hayden, to whom none of the names of those present was mentioned, she says:
We sat for at least a quarter of an hour and were beginning to apprehend a failure, when a very small throbbing or patting sound was heard, apparently in the centre of the table. Great was our pleasure when Mrs. Hayden, who had before seemed rather anxious, said, "They are coming." Who were coming? Neither she nor we could tell. As the sounds gathered strength, which they seemed to do with our necessary conviction of their genuineness, whatever might be their origin, Mrs. Hayden said, "There is a spirit who wishes to speak with someone here, but as I do not know the names of the gentlemen and ladies, I must point to each in turn, and, when I come to the right one, beg that the spirit will rap." This was agreed to by our invisible companion, who rapped in assent. Mrs. Hayden then pointed to each of the party in turn. To my surprise, and even annoyance (for I did not wish this, and many of my friends did), no sounds were heard until she indicated myself, the last in the circle. I was seated at her right hand; she had gone round from the left. I was then directed to point to the letters of a large type alphabet, and I may add that, having no wish to obtain the name of any dear friend or relation, I certainly did not rest, as it has been surmised is often done, on any letter. However, to my astonishment, the not common name of a dear relation who had left this world seventeen years before, and whose surname was that of my father's, not my husband's, family was spelt. Then this sentence, "I am happy, and with F. and G." (names at length). I then received a promise of future communication with all three spirits; the two last had left the world twenty and twelve years before. Other persons present then received communications by rapping; of these some were as singularly truthful and satisfactory as that to myself, while others were false and even mischievous.