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Entered, according to Act of Congress, in the year 1845, by
HARPER & BROTHERS,
in the Clerk's Office of the Southern District ( New York.
In undertaking to prepare the present volume, I was strongly influenced by a conviction of the practical importance of the subject. It is perhaps true, that the public mind is but little informed, certainly much less than it should be, in relation to the true doctrines of regular or normal mental action; but it is, undoubtedly, much more ignorant of the philosophy of defective and disordered mental action. Nor is it surprising that this should be the case, when we consider that but very few writers, even of those who have professedly devoted themselves to mental inquiries, have particularly investigated this portion of the Philosophy of Mind. It has, in fact, been almost totally neglected, except by a few learned and philosophical writers of the medical profession, who, in the discharge of their professional duties, could not well avoid giving some attention to this subject. But the books of these writers, of great value as they undoubtedly are, are for the most part taken up with the consideration of disordered mental action as it is connected particularly with the physical system, and with various practical directions having relation to the treatment of insane persons.
These works were not designed for popular circulation; nor, as a matter of fact, has this been the case.
Under these circumstances, it naturally suggested
itself to the proprietors of the Family Library that
THOMAS C. UPHAM.