It is not my object to treat metaphysically any of those powers of the mind which, either in health or disease, exhibit, in certain states, many extraordinary phases. The struggling energies of conscience loaded with crime, have been witnessed by philosophers who have denied the existence of the moral sense as an original power; but of what avail is their scepticism, when they are bound to admit that this great sanction of God's law is incident to all mankind--having been found as vivid and strong in the new-found islands of Polynesia, as it ever was in the Old World? It would be for the interest of mankind if those who call themselves its teachers, and dignify themselves with the name of investigators of truth, had looked more often at the workings of this extraordinary power--witnessed and described the agonies of the heart convulsed by its throes, heard and narrated the piercing cries and the flaming words that are wrung from the throat of him who is under its scorpion lash, felt and told the horrors of those sights and sounds--instead of inquiring whether it is connate or constructed by social and political institutions. Yet this, too, has been done, and well done; and it is not because the effects are unknown, or have been inadequately described, that I contribute the results of my experience on this interesting subject, but simply because I conceive they cannot be too well known, or too forcibly delineated, in a country where a struggling competition of interests and a fierce ambition are exerted hourly in attempting to still the voice of the monitor that so indefatigably and thanklessly whispers a better life.