The indulgence of the public has been already extended to several works which I have submitted to its decision on the subject of INSANITY; and the same favourable interpretation is now solicited for the present performance, --which attempts the more difficult investigation of SOUND MIND. In treating of Mental Derangement, I became very early sensible, that a competent knowledge of the faculties and operations of the Intellect in its healthy state, was indispensably necessary to him, who professed to describe its disorders