"To upset the conclusion that all crows are black, there is no need to seek demonstration that no crows are black; it is sufficient to produce one white crow; a single one is sufficient." Lenora Piper was William James' One White Crow.
Reading the book Blum , D. (2006). Ghost Hunters: William James and the Search for Scientific Proof of Life After Death. Penguin Press. Retrieved December 5, 2008, from http://www.amazon.com/gp/reader/1594200904/ref=sib_dp_pt#reader-link.
Excellent story about William James early studies into paranormal phenomena. He is considered the father of Psychology and he was instrumental in developing many theories of human behavior. This book is a semi-historical account of some of the activities that James initiated with the Society for Psychical Research.
It is interesting to note James willingness to investigate in the true spirit of open minded inquiry in an area where the settled science at the time said that paranormal phenomena were bunk. He was active at a time when scholasticism and the influence of the church on academia were being questioned and rejected.
James also was the author of "Varieties of Religious Experience".