The London of Challoner consisted only of some seven square miles, one square mile of which was, of course, the City of London. It can all be put onto some eight pages of the present A–Z map of London, which at the time of writing consists of 141 pages. John Rocques's map of London, on a scale of 200 feet to the inch, which he began in 1738 and finished in 1747, in its London Topographical Society format of 1982, perfectly illustrates the London of both Challoner and Defoe. The western extremities were at Marylebone, Knightsbridge and Chelsea, the eastern at Stepney, Limehouse and Deptford, the northern at Tottenham Court and Bethnal Green, while the southern limits were at Kennington and Walworth Common. The population of London was assessed by Wrigley in 1990 as c. 575,000 in 1700, as c. 675,000 in 1750 and as c. 959,000 in 1801. The 1767 papist returns indicated that most London Catholics lived in the parishes of St James and St Giles, within Westminster. Schwarz has pointed out the considerable social segregation in London, middle-class areas being in the west and central parts, with the poorer areas in the south and east. The St Giles area around Seven Dials going east to Bow Street and Drury Lane is reputed to have contained a third of the capital's beggars and to have been a notoriously criminal quarter. The Catholic numbers in Westminster were 7,724, the City numbers 1,492, with the Middlesex out-parishes having more than 2,000. The 1767 total for London, including the parishes to the south and east, comes to 12,320, clearly too low, as is the accumulated total for the London District of around 15,800. This gives about 3,500 for the London District outside the capital while Challoner's own figures give us a Catholic population of 5,261. If the errors in enumeration were the same in both areas (a large assumption), this enables us to guess that the 1767 figures could be corrected to about 18,500 London Catholics and about 24,000 for the whole District.