Margaret A. Dorsey
[Sixth Sense is a]lucid overview of various types of psychic phenomena. The author clearly explains the nature of telepathy, clairvoyance, and precognition, and also discusses psychometry, retrocognition, astral projections, mediums, possession, psychokinesis, psychic photography and healing, and the tricks of phony mediums and mentalists. Suggestions for testing and developing one's own ESP are given at the end. The author cites various case histories, the experiences of such people as Edgar Cayce, Jean Dixon and Ted Serios, and the results of laboratory experiments whenever possible, to give a generally accurate and balanced picture of present knowledge about parapsychology; however, when discussing more nebulous, untestable areas such as retrocognition (intuitive knowledge of the past), Mr. Kettelkamp does not suggest that such knowledge may be due to a form of clairvoyance, but appears to lean toward the belief that such manifestations support theories of reincarnation. The same criticism applies to the discussion of mediumistic experiences as indicative of survival after death and, partially, to that of astral projection. Nevertheless, this is a clearly written, well-organized book on a fascinating subject, and it will be popular. (p. 49)
Margaret A. Dorsey, in School Library Journal (reprinted from the December, 1970 issue of School Library Journal, published by R. R. Bowker Co. A Xerox Corporation; copyright © 1970), December, 1970.