I propose in this lecture to pass in review the various forms of insanity which you find in the Table, and by a brief reference to their history and symptoms to show you how they really are distinct forms of disease, and that in each or nearly so there will be found some peculiarities in the symptoms or progress of the case which render it somewhat different from other forms of insanity; such in fact as in many instances would lead you to detect the cause, and such certainly as to justify us in classifying it as a distinct form of insanity.