Mr. President and Gentlemen,—I have had a little difficulty with my title, because the disease to which I want to refer is known under so many names. “Exhaustion psychosis” is one, and the same disease is also described as “post-febrile insanity,” “acute confusional insanity” and “acute hallucinatory insanity”; while on the Continent, I think, psychiatrists are unanimous in applying to it the name “amentia.” But “amentia” in this country has a different meaning, so that we cannot adopt that term here. Having, however, given you the list of names by which the condition is known, you will recognise the disease to which I refer.