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To defraud any man of his due praise is unworthy of a philosopher; I shall, therefore, openly confess that I owe the first hint of this inestimable secret to the rabbi Abraham Ben Hannase, who, in his treatise of precious stones, has left this account of the magnet: [Hebrew: chkalamta],etc. “The calamita, or loadstone that attracts iron, produces many bad fantasies in man. Women fly from this stone. If, therefore, any husband be disturbed with jealousy, and fear lest his wife converses with other men, let him lay this stone upon her while she is asleep. If she be pure, she will, when she wakes, clasp her husband fondly in her arms; but if she be guilty, she will fall out of bed, and run away.”

When I first read this wonderful passage, I could not easily conceive why it had remained hitherto unregarded in such a zealous competition for magnetical fame. It would surely be unjust to suspect that any of the candidates are strangers to the name or works of rabbi Abraham, or to conclude, from a late edict of the Royal Society in favour of the English language, that philosophy and literature are no longer to act in concert. Yet, how should a quality so useful escape promulgation, but by the obscurity of the language in which it was delivered? Why are footmen and chambermaids paid on every side for keeping secrets, which no caution nor expense could secure from the all-penetrating magnet? Or, why are so many witnesses summoned, and so many artifices practised, to discover what so easy an experiment would infallibly reveal?

Full of this perplexity, I read the lines of Abraham to a friend, who advised me not to expose my life by a mad indulgence of the love of fame: he warned me by the fate of Orpheus, that knowledge or genius could give no protection to the invader of female prerogatives; assured me that neither the armour of Achilles, nor the antidote of Mithridates, would be able to preserve me; and counselled me, if I could not live without renown, to attempt the acquisition of universal empire, in which the honour would perhaps be equal, and the danger certainly be less.

I, a solitary student, pretend not to much knowledge of the world, but am unwilling to think it so generally corrupt, as that a scheme for the detection of incontinence should bring any danger upon its inventor. My friend has indeed told me that all the women will be my enemies, and that, however I flatter myself with hopes of defence from the men, I shall certainly find myself deserted in the hour of danger. Of the young men, said he, some will be afraid of sharing the disgrace of their mothers, and some the danger of their mistresses; of those who are married, part are already convinced of the falsehood of their wives, and part shut their eyes to avoid conviction; few ever sought for virtue in marriage, and therefore few will try whether they have found it. Almost every man is careless or timorous, and to trust is easier and safer than to examine.

These observations discouraged me, till I began to consider what reception I was likely to find among the ladies, whom I have reviewed under the three classes of maids, wives, and widows, and cannot but hope that I may obtain some countenance among them. The single ladies I suppose universally ready to patronise my method, by which connubial wickedness may be detected, since no woman marries with a previous design to be unfaithful to her husband. And to keep them steady in my cause, I promise never to sell one of my magnets to a man who steals a girl from school; marries a woman of forty years younger than himself; or employs the authority of parents to obtain a wife without her own consent.

Among the married ladies, notwithstanding the insinuations of slander, yet I resolve to believe, that the greater part are my friends, and am at least convinced, that they who demand the test, and appear on my side, will supply, by their spirit, the deficiency of their numbers, and that their enemies will shrink and quake at the sight of a magnet, as the slaves of Scythia fled from the scourge.