There were many guidebooks and manuals of insanity in the late 19th and early 20th centuries. It was a competitive, potentially lucrative field, in which the mind doctors could put into print their theories and guidance based on their own practice. This 1872 forerunner to the Diagnostic and Statistical Manual (DSM) bases its categories on the personal observations of the two doctors. It is not particularly unusual for its time in England, though “monomania” was on its way out as a diagnosis, and “hysteria” doesn’t feature here as regularly as in other works.