Morell says: "We have every reason to believe that mental power when once called forth follows the analogy of everything we see in the material universe in the fact of its perpetuity. Every single effort of mind is a creation which can never go back again into nonentity. It may slumber in the depths of forgetfulness as light and heat slumber in the coal seams, but there it is, ready at the bidding of some appropriate stimulus to come again out of the darkness into the light of consciousness." Beattie says: "That which has been long forgotten, nay, that which we have often in vain endeavored to recollect, will sometimes without an effort of ours occur to us on a sudden, and, if I may so speak, of its own accord." Hamilton says: "The mind frequently contains whole systems of knowledge which, though in our normal state they may have faded into absolute oblivion, may in certain abnormal states, as madness, delirium, somnambulism, catalepsy, etc., flash out into luminous consciousness.... For example, there are cases in which the extinct memory of whole languages were suddenly restored." Lecky says: "It is now fully established that a multitude of events which are so completely forgotten that no effort of the will can revive them, and that the statement of them calls up no reminiscences, may nevertheless be, so to speak, embedded in the memory, and may be reproduced with intense vividness under certain physical conditions." In proof of the above, the authorities give many instances recorded in scientific annals. Coleridge relates the well-known case of the old woman who could neither read nor write, who when in the delirium of fever incessantly recited in very pompous tones long passages from the Latin, Greek and Hebrew, with a distinct enunciation and precise rendition. Notes of her ravings were taken down by shorthand, and caused much wonderment, until it was afterwards found that in her youth she had been employed as a servant in the house of a clergyman who was in the habit of walking up and down in his study reading aloud from his favorite classical and religious writers. In his books were found marked passages corresponding to the notes taken from the girl's ravings. Her subconscious memory had stored up the sounds of these passages heard in her early youth, but of which she had no recollection in her normal state. Beaufort, describing his sensations just before being rescued from drowning says: "Every incident of my former life seemed to glance across my recollection in a retrograde procession, not in mere outline, but in a picture filled with every minute and collateral feature, thus forming a panoramic view of my whole existence."