This is a very valuable summary of our knowledge concerning Kraepelin's interesting conception of the dementia of adolescence. The history of this disease recalls that of general paralysis, under which were at one time grouped quite a number of different conditions, and conversely to which we now refer a number of cases at one time considered quite unlike in their pathology. For we see that subjects formerly labelled as suffering from various psychoses—maniacal excitement, melancholia, stupor, katatonia, delusional state in the degenerate, primary or secondary mental weakness, primary dementia, etc.—in reality exhibit but various manifestations of a distinct disease, dementia prócox, characterised by certain special symptoms and by its evolution. Moreover it is often possible, as in the case of general paralysis, to diagnose the affection in its first stage. Let us therefore give up the idea that dementia præcox is a complication of various insanities (secondary dementia, etc.), but endeavour to diagnose the disease in its early stage and thus obtain valuable data for prognosis.
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