an account of infinity being involved), but that we are concerned with the question of survival after 'death'. I think we may agree with Professor Lewis when he says about this hypothesis: "Our understanding of what would verify it has no lack of clarity." In fact, I can easily imagine e.g. witnessing the funeral of my own body and continuing to exist without abody, for nothing is easier than to describe a world which differs from our ordinary world only in the complete absence of all data which I would call parts of my own body.
We must conclude that immortality, in the sense defined, should not be regarded as a 'metaphysical problem', but is an empirical hypothesis, because it possesses logical verifiability. It could be verified by following the prescription: 'Wait until you die!' Professor Lewis seems to hold that this method is not satisfactory from the point of view of science. He says (143) : The hypothesis of immortality is unverifiable in an obvious sense. ... if it be maintained that only what is scientifically verifiable has meaning, then this conception is a case in point. It could hardly be verified by science; and there is no observation or experiment which science could make, the negative result of which would disprove it.
I fancy that in these sentences the private method of verification is rejected as being unscientific because it would apply only to the individual case of the experiencing person himself, whereas a scientific statement should be capable of a general proof, open to any careful observer. But I see no reason why even this should be declared to be impossible. On the contrary, it is easy to describe experiences such that the hypothesis of an invisible existence of human beings after their bodily death would be the most acceptable explanation of the phenomena observed. These phenomena, it is true, would have to be of a much more convincing nature than the ridiculous happenings alleged to have occurred in meetings of the occultists — but I think there cannot be the slightest doubt as to the possibility (in the logical sense) of phenomena which would form a scientific justification of the hypothesis of survival after death, and would permit an investigation by scientific methods of that form of life. To be sure, the hypothesis could never be established as absolutely true, but it shares this fate with all hypotheses. If it should be urged that the souls of the deceased might inhabit some super celestial space where they would not be accessible to our perception,
