Most of you are aware that not many months ago the Editors of the “Journal of Mental Science” invited communications from members of the Association of which it is the organ on a subject which never loses its interest, simply because events are frequently occurring which force medical psychologists to direct their attention to it. I refer to what usually passes under the name of Moral or Emotional Insanity. The very fact that it is thus forced upon our notice proves it to be a practical, not a merely speculative question. I offer no apology, therefore, for making it the theme of my paper to-day, especially as I have not joined in the discussion which has taken place in the Journal, and which now has terminated. I say “discussion,” but one of the most marked features of these communications is their essential unanimity.