IN debatable matters, such as psychical research, readers may naturally wish for information which shall enable them to estimate the amount of a writer's bias. It may therefore be useful to affirm that, at the begin ning of my investigations, my prejudices and wishes were opposed to the conclusions which the facts gradu ally forced upon me. If I am now biased in favour of the belief in personal life after death, it is objective fact, not subjective preference, that has brought it about. And my judgments have not been hasty. I have worked at the subject for over eleven years.