This is a disorder or confusion of mind, in acute disease, not fixed for a long time like insanity, but depending upon a temporary cause. It is present in many attacks of maladies attended by fever ; as severe remittent, typhus, typhoid, scarlet, or yellow fever, etc. A few persons are liable to transient delirium during almost any brief attack of illness. Mania-a-potu, as already said, has a characteristic delirium, in which, almost always, there is extreme terror, from imaginary enemies or dangers of some kind. Grown people are affected by delirium usually under circumstances which, in a child, would bring on convulsions.