useful to mankind, he shall consult with any other three men of science whose names are a guarantee for probity and knowledge, and according to the best of his judgment, after such consultation, suppress or publish the passage of which he has so doubted. I own the ambition which first directed me towards studies of a very unusual character, and which has encouraged me in their pursuit through many years of voluntary exile, in lands where they could be best facilitated or aided,--the ambition of leaving behind me the renown of a bold discoverer in those recesses of nature which philosophy has hitherto abandoned to superstition. But I feel, at the moment in which I trace these lines, a fear lest, in the absorbing interest of researches which tend to increase to a marvellous degree the power of man over all matter, animate or inanimate, I may have blunted my own moral perceptions; and that there may be much in the knowledge which I sought and acquired from the pure desire of investigating hidden truths, that could be more abused to purposes of tremendous evil than be likely to conduce to benignant good. And of this a mind disciplined to severe reasoning, and uninfluenced by the enthusiasm which has probably obscured my own judgment, should be the unprejudiced arbiter. Much as I have coveted and still do covet that fame which makes the memory of one man the common inheritance of all, I would infinitely rather that my name should pass away with my breath, than that I should transmit to my fellowmen any portion of a knowledge which the good might forbear to exercise and the bad might unscrupulously pervert. I bear about with me, wherever I wander, a certain steel casket. I received this casket, with its contents, from a man whose memory I hold in profound veneration. Should I live to find a person whom, after minute and intimate trial of his character, I should deem worthy of such confidence, it is my intention to communicate to him the secret how to prepare and how to use such of the powders and essences stored within that casket as I myself have ventured to employ. Others I have never tested, nor do I know how they could be resupplied if lost or wasted. But as the contents of this casket, in the hands of any one not duly instructed as to the mode of applying them, would either be useless, or conduce, through inadvertent and ignorant misapplication, to the most dangerous consequences; so, if I die without having found, and in writing named, such a confidant as I have described above, I command you immediately to empty all the powders and essences found therein into any running stream of water, which will at once harmlessly dissolve them. On no account must they be cast into fire!