GOSSIP WITH READERS AND CORRESPONDENTS.--If any of our readers are desirous of looking into the _rationale_ of irrationality, to employ a highly 'unitive' phrase, let them take up, if they can command it, the '_Annual Report of the Managers of the New York State Lunatic Asylum_,' one of the clearest and most comprehensive documents in its kind that we have ever perused. It proceeds from the capable pen of A. BRIGHAM, M. D. the superintendent and physician of the institution, and is full upon the definition, causes and classification of insanity; the size and shape of the heads of the patients; the pulse; description of the building; daily routine of business, diet, labor, amusements, religious worship, visitors, suggestions to those who have friends whom they expect to commit to the care of the asylum, etc., etc. The cause of insanity in _fifty_ out of two hundred and seventy-six patients is attributed to religious anxiety, produced by long attendance on protracted religious meetings, etc. Want of sleep is decidedly the most frequent and immediate cause of insanity, and one the most important to guard against. 'So rarely (says the superintendent) do you see a recent case of insanity that is not preceded by want of sleep, that we regard it as almost the sure precursor of mental derangement.' As evidences of the difficulty of arranging the insane in classes, founded on symptoms, Dr. BRIGHAM gives us the following synopsis of individual peculiarities noticed among certain of the inmates of the Asylum: