Towards the close of the eighteenth century, credulity and imposition shook hands heartily and held a great festival. Throughout civilized Europe a sort of carnival of empiricism prevailed. Quack was king. A spurious leaven of charlatanism was traceable in politics, in science, in religion--pervaded all things indeed. The world was mad to cheat or to be cheated. The mountebank enjoyed his saturnalia. Never had he exhibited his exploits before an audience so numerous and so sympathetic--so eager to be swindled, so liberal in rewarding the swindler. Gravely does Miss Hannah More address Mr. Horace Walpole, concerning what she terms the 'demoniacal mummery'--'the operation of fraud upon folly' which then occupied the country. 'In vain do we boast of the enlightened eighteenth century, and conceitedly talk as if human reason had not a manacle left about her, but that philosophy had broken down all the strongholds of prejudice, ignorance, and superstition; and yet, at this very time, Mesmer has got a hundred thousand pounds by animal magnetism in Paris, and Mainaduc is getting as much in London. There is a fortune-teller in Westminster who is making little less. Lavater's physiognomy books sell at fifteen guineas a set. The diving [divining?] rod is still considered as oracular in many places. Devils are cast out by seven ministers; and, to complete the disgraceful catalogue, slavery is vindicated in print and defended in the House of Peers! Poor human nature, when wilt thou come to years of discretion?' Mr. Walpole writes back (he has always a _proper_ tone for Miss More, reserving his levity and license for less staid correspondents):--'Alas! while Folly has a shilling left, there will be enthusiasts and quack doctors;' and he adds, airing his pet affectation--a hatred of royalty, a love for republicanism--'and there will be slaves while there are kings or sugar-planters.' Joseph Balsamo--more generally known by his pseudonym of Count Alexander De Cagliostro, expelled from France, after nine months' durance in the Bastille, on account of his complicity in the diamond necklace fraud and scandal--had taken refuge in England, bringing with him a long list of quackeries and impostures; among them, his art of making old women young again; his system of 'Egyptian freemasonry,' as he termed it, by virtue of which the ghosts of the departed could be beheld by their surviving friends; and the secrets and discoveries of the great Dr. Mesmer in the so-called science of animal magnetism. Walpole at once proclaims the man a rascal, and proposes to have him locked up for his mummeries and impositions. Miss More laments that people will talk of nothing else. 'Cagliostro and the cardinal's necklace,' she writes, 'spoil all conversation, and destroyed a very good evening at Mr. Pepys's last night' A discussion of such subjects was by no means compatible with Miss More's notion of a good evening.