[4] According to the psychical researcher Robert Ashby "[Prince] remained highly skeptical of PK and other physical phenomena, but felt that there was no doubt at all of telepathy, clairvoyance and precognition.

[1] He was the only American, other than William James, who occupied the position of President of the Society for Psychical Research in London, which he did for two years 1930 and 1931.

To help expose fraud, he familiarised himself with the tricks of conjurors and became a member of the Society of American Magicians.

[1] In 1921, Prince travelled to Mexico and collaborated with the German physician Gustav Pagenstecher on experiments with the clairvoyant Senora Maria Reyes de Zierold in psychometry.

He told Hans Driesch that the experiments with Zierold had converted him, that he had gone to Mexico a skeptic but came back a "psychist".

[1] By 1925 due to the investigation of Mina Crandon the American Society for Psychical Research had been taken over by a spiritualist faction.

[7] Prince in a letter to magician Joseph Rinn on February 1, 1934 described the Crandon case as "the most ingenious, persistent, and fantastic complex of fraud in the history of psychic research.

She had developed the ability to maneuver a stiletto using only her feet and was thus able to write names on cigarette cases when they were held under the table.

[11] Prince attended a series of séance sittings with Rudi Schneider and no paranormal phenomena was observed.

In his notes in the Bulletin VII of the Boston SPR published under Experiments with Physical Mediums in Europe (1928) he wrote "despite my studied and unremitting complaisance, no phenomena have occurred when I had any part in the control, save curtain movement which were capable of the simplest explanation.