did not occur at all. That is surely an entirely unwarranted supposition, and were this carried to its logical conclusion, would suffice to disprove the whole of the past history of the human race. Miss Johnson's discussion of Home's famous levitation out of one window and in at another is surely masterly, and is precisely the kind of criticism which psychic research needs. After reading her account, I can only say that were this case an isolated incident, unsupported by any similar eases of a like nature, it would be so far "explained away" as to lose all evidential value. At the same time I think that Count Solovovo sums the whole argument up when he says that none of Home's phenomena were ever _proved_ to be hallucinatory; all that has been done by the discussion is to show that some of them _might possibly_ have been so. And there is a great difference between the two. There is a natural tendency in many minds to assume and take for granted that because a given phenomenon might possibly have been produced by fraud, it was unquestionably produced in that manner. That is quite an unwarranted supposition, and fraud should be clearly _proved_ in every given instance before a medium be charged with trickery. This is a rule far too seldom observed by sceptical investigators, but an important one nevertheless. Leaving aside this particular case of Home's levitation, however, it may be said that there are others on record far more conclusive in character, and against which many of Miss Johnson's criticisms could not be levelled. Taken singly, it is probable that no single case of any class of phenomena would prove convincing to a sceptic; sufficient objections could be raised, and sufficient discrepancies in the records pointed out, to invalidate any evidence whatever. Quite apart from any _a priori_ objections, any single incident can almost invariably be "explained away." It is the weight of a great _mass_ of cumulative evidence which tells the tale. The most expert and exact description of the fall of a meteor would not have forced an acceptance from the scientific world; the relative improbability of the whole of the past experience of the human race would have been so much greater than the fact that the latter would have been discredited. Gradually it would have receded in the mind, and even the original witness might ultimately be persuaded that he had not in reality seen a meteor at all!