ACKNOWLEDGMENTS
It is a pleasure to thank the John Simon Guggenheim Memorial Foundation for the grant of a fellowship which made this study possible.
Especial thanks are due to the Library of the Royal Academy of Sciences in Stockholm, to the Library of Yale University, and to the Library of the Academy of the New Church, Bryn Athyn, Pa., for the facilities offered by them, and to Cyriel Odhner Sigstedt, also of Bryn Athyn, for her generosity in lending the writer new material which she herself had found in Sweden.
The editor of the Journal of the American Society for Psychical Research, Mrs. Laura Abbott Dale, has been unfailingly helpful. The late Whately Carington, of Sennen Cove, Cornwall, England, was good enough to read and discuss the chapters largely based on his theories, while Professor Gardner Murphy, The City College of New York, must accept thanks for his great kindness in reading the whole book in manuscript.
