You may hunt for "The Maniac," by E. Thelmar, which the Observer
reviewed favorably: "This study of an acute attack of mania is absolutely,
even violently, convincing...The book is painfully interesting. Only an
alienist can judge of its physiological value...Some points that the author
makes as to the consciousness and unconsciousness of the insane, and as
to the preservation of reason through all delusions, are extraordinarily
interesting."