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Outside theosophy, investigations of a purely scientific nature have been made in the baffling regions of survival and reincarnation. Neospiritualism, or psychicism or experimental spiritualism, had its origin in America in 1870. In the following year, the first strictly scientific experiments were organized by Sir William Crookes, the man of genius who opened up most of the roads at the end of which men were astounded to discover unknown properties and conditions of matter; and, as early as 1873 or 1874, he obtained, with the aid of the medium Florence Cook, phenomena of materialization that have hardly been surpassed. But the real inauguration of the new science dates from the foundation of the Society of Psychical Research, familiarly known as the S.P.R. This society was formed in London, twenty-eight years ago, under the auspices of the most distinguished men of science in England and has, as we know, made a methodical and strict study of every case of supernormal psychology and sensibility. This study or investigation, originally conducted by Edmund Gurney, F. W. H. Myers and Frank Podmore and continued by their successors, is a masterpiece of scientific patience and conscientiousness. Not an incident is admitted that is not supported by unimpeachable testimony, by definite written records and convincing corroboration; in a word, it is hardly possible to contest the essential veracity of the majority of them, unless we begin by making up our minds to deny any positive value to human evidence and by making any conviction, any certainty impossible that derives its source therefrom.[[4]] Among those supernormal manifestations, telepathy, telergy, previsions and so forth, we will take cognizance only of those which relate to life beyond the grave. They can be divided into two categories: (1) real, objective and spontaneous apparitions, or direct manifestations; (2) manifestations obtained by the agency of mediums, whether induced apparitions, which we will put aside for the moment because of their frequently questionable character,[[5]] or communications with the dead by word of mouth or automatic writing. We will stop for a moment to consider those extraordinary communications. They have been studied at length by such men as F. W. H. Myers, Richard Hodgson, Sir Oliver Lodge and the philosopher William James, the father of the new pragmatism; they profoundly impressed and almost convinced these men and they therefore deserve to arrest our attention.