It would be superfluous to deal with the fallacies involved in these statements: they served to satisfy those who were disposed to be satisfied, and inoculation became the fashion among the scientific and enlightened. Dr. Tronchin, a well-known inoculator, was summoned from Geneva to Paris in 1756 to operate upon the children of the Duke of Orleans, and his success was pronounced decisive. Nevertheless inoculation did not extend beyond people of leisure and culture, and in 1763 an outbreak of smallpox in Paris made an end of the practice. An inquiry was instituted by the authorities, and the evidence left no doubt that the epidemic had been diffused, if it did not originate, with the artificially poxed; and inoculation was thenceforth prohibited in Paris. Any citizen who was resolved to have the induced disease had to retire to country quarters. Here we may observe that the confidence of the inoculator was grounded on the assumption that whoever had once passed through smallpox, whether natural or artificial, could never again contract the disease. Nevertheless the inoculated did contract the disease, and the disaster was uniformly accounted for as due to some imperfection in the inoculation. There were also instances of smallpox after smallpox, but these, too, were discredited; the first smallpox could not have been smallpox, but chickenpox, measles, or some other eruptive disorder. There was a conspicuous confutation of these evasions in the case of Louis XV. He had smallpox unquestionably in his 14th year, and of unquestionable smallpox he died in 1774 in his 64th year. Notwithstanding, the assertion was perpetuated that there was no possibility of smallpox after smallpox, and it was only when it became necessary to maintain the credit of vaccination that the facts were admitted; and in this form--Smallpox after vaccination is no more common or extraordinary than smallpox after smallpox--a falsehood on the back of a former falsehood. We have seen under what safeguards inoculation was practised in Boston, and now we shall turn to Geneva and discover how all the American precautions were set at naught in that city with apparent impunity. The details are from a letter of the Council of Geneva, dated 24th December, 1791, addressed to Dr. Haygarth in answer to his inquiries and suggestions. Des Gouttes, secretary to the Geneva Syndic, wrote-- I.--The Republic of Geneva contains about 35,000 inhabitants, of whom 26,000 dwell in the city, and 9,000 in the adjacent country. II.--The city is of small extent, and ill adapted to so large a population; and its extension is not easy on account of the fortifications wherewith it is surrounded. There are little more than 1200 houses in the city, which are built in many storeys of many apartments like the ancient part of Edinburgh, each house sheltering on an average twenty-one inhabitants.