Medical practice lay mostly among the richer classes; the physicians knew little of the state of health in the cellars and tenement-houses of large towns. Those physicians who did know how much typhus fever there was in these purlieus had to enter a caveat against the incredulity of the rest. Dr Currie of Liverpool, whose facts I shall give in their place, protested that he was not exaggerating; a protest the more necessary that a contemporary of his own, Mr Moss, a middle-class practitioner, who wrote a book specially on the medical aspects of Liverpool, declares that fever is “rare” in that city, while Currie was treating from his dispensary a steady average of three thousand cases of typhus every year. In the same years, in February, 1779, a physician to the army, Dr John Hunter, who had commenced practice in Mayfair, found on visiting in the homes of the poorer classes in the west of London cases of fever for which he had no other name than the gaol or hospital fever of his military experience; it was so much a novelty to him, apart from campaigns or transport ships, that he gave an account of his discovery of domestic typhus to the College of Physicians[240]. At length he found so many cases steadily winter after winter that he had them sent to the infirmary of the Marylebone Workhouse. The practitioners who knew most of the sicknesses of the poor were such as Robert Levett, Dr Samuel Johnson’s dependant, who lived with the doctor in the house in Gough Square. Levett had been a waiter in a Paris coffee-house frequented by the medical fraternity, and had acquired a taste for and perhaps some knowledge of the healing art. He made his modest living by the small fees or articles of food and drink which his poor patients gave him. He had only to issue from the back of Gough Square by the courts and alleys behind Fleet Street, and he would find in the region between Chancery Lane and Shoe Lane hundreds of families seldom visited by a physician or by a qualified surgeon-apothecary. The good Levett was only one of a class. There had always been such humble medical attendants of the poor in London. An Act of the third year of Henry VIII. was directed against them at the instance of the privileged practitioners; but the regular faculty is said to have proved in the sequel both greedy and incompetent, and after thirty years there came another Act, couched in terms that the bluff king himself might have indited (31-32 Henry VIII.), which asserts those qualities of the profession in so many words, and establishes the right of any subject of the king to practise minor surgery and the medicine of simples upon his or her neighbours. That Act is still part of the law of England, and under it Levett exercised a statutory right, perhaps without knowing it[241]. There were many other regions of courts and alleys all round the City on both sides of the water, which must have been medically served by such as Levett, if served at all. It