There is no overwhelming delusion paralyzing the mind, so to speak, as in melancholia attonita (melancholia with stupor). In acute cases the brain quickly falls into a state of profound anæmia, precisely such as is {165} found post-mortem in starved dogs, and loses its power to a greater or less extent of reacting to the stimulus of the senses. There is little or no sensation of hunger, the sensory nerves are nearly or quite paralyzed, the bladder and rectum become distended until urine and feces are voided unconsciously or at least uncontrolled, and voluntary movements almost cease, although the muscles are capable of acting if directed: if led or pushed, the patient walks; if placed in a chair or bed, remains there; and in the worst cases lies on the floor quite inattentive to all the decencies of life unless constantly looked after. There is always partial, and there may be complete, anæsthesia, to such an extent that even the involuntary muscles do not respond to the ordinary stimuli. There is rapid loss of flesh, very sluggish circulation, and feeble heart-action. After recovery the patient speaks of the stage of his greatest illness as a blank in his memory. This description of pronounced cases of primary dementia of the most severe type needs modification as applied to milder cases, which may exist in all degrees, down to a state of mental impairment of very moderate extent. The mental impairment may be progressive and quite incurable, but also so slight in the beginning, and may make such slow progress, as to entirely escape detection for several years, and then attract attention at first by the lowered plane of character and loss of self-control in little matters of daily life, rather than by the intellectual deterioration, which by that time has become quite marked. This subacute form of primary dementia in young people rarely finds its way into the insane asylum until the second, third, or fourth year of its course, and then its progress is slowly downward. It has none of the eccentric or grotesque features of hebephrenia, and little of its emotional disturbances. Subacute primary dementia in the later years of maturity, just before or several years before the climacteric, is of grave import, as it indicates the development of an hereditary predisposition to insanity in a form which not only offers no reasonable hope of recovery, but also is quite certain to manifest a change of character which is even more difficult to treat and properly control than the intellectual failure. As it is most likely to arise under circumstances of wear and worry, its symptoms may be for a long time attributed to disappointment or bad temper. After the dementia becomes pronounced its downward course is seldom otherwise than very rapid.