Psychopathia Sexualis was a 19th century book of case studies of Human sexual behavior.

In Dangerous Ground, a copy of this book was in the living room of the Wilson house. Doctor John Rawley, a visitor to the house, considered the book as the foremost reference on abnormal psychology. (TNG: "The Big Goodbye")

The pages seen in the episode were from the mystery novel Dangerous Ground by author Frances Sil Wickware. This novel was published in 1946. Information on this story was from page 37.
This book was written by the psychiatrist Richard von Krafft-Ebing.

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