inevitably enters the air-passages in large quantities. The dust is not removed every day, but, saturated with water in the great thoroughfares, sometimes ferments in damp weather, and at other times ascends again under the heat of the summer sun as atmospheric dust.” London, says Henry Mayhew, may be safely asserted to be the most densely populated city in all the world; containing one-fourth more people than Pekin, and two-thirds more than Paris—more than twice as many as Constantinople—four times as many as St. Petersburg—five times as many as Vienna, or New York, or Madrid—nearly seven times as many as Berlin—eight times as many as Amsterdam—nine times as many as Rome—fifteen times as many as Copenhagen—and seventeen times as many as Stockholm. “London,” says Horace Say, “c’est une province couverte de maisons.” It covers an area of 122 square miles in extent, or 78,029 statute acres; and contains 327,391 houses. Annually 4000 new houses are in erection for upwards of 40,000 new-comers. The continuous line of buildings stretching from Highgate to Camberwell is said to be 12 miles long. It is computed if the buildings were set in a row they would reach across the whole of England and France, from York to the Pyrenees. When the stone in Panyer’s Alley was placed on its site three centuries since, the circumference was about five miles. At present, however, to make a pedestrian expedition around the metropolis would, to most persons, be an undertaking of some importance, as may be seen by referring to the following particulars, which have been gathered from a recently published map:—From Chiswick to Kentish-town, 12 miles; from Kentish-town to Millwall, 17½ miles; from Millwall to Chiswick, 28 miles—total, 57½ miles, very nearly three days’ journey, at the rate of 20 miles a day; and it will be observed that in the line drawn, Battersea, Clapham, Canning-town, and many other places, which even at present can be scarcely said to be separated from London, have been left out. “As the crow would fly” across streets and houses from the point whence we started at Chiswick to the farthest east, the distance is nearly eleven miles, and the greatest width from north to south upwards of seven miles. The metropolis is divided into 38 different poor-law districts, some of them parishes, and some of them unions, but each managing separately their own poor. Of these, 27 are in Middlesex, two in Kent, and nine in Surrey. Of the 27 in Middlesex, 10 are unions of various extent; 17 are single parishes, many of them of great extent, and comprising a large amount of property and population. The unions in Middlesex consist of a small number of parishes, two consisting of two parishes, two of three, one of five, one of four, one of six, one of seven, and one of nine parishes. The city of London consists of 98 parishes, some of them small in extent, but containing a large amount of property and population. The unions in Kent consist of four and seven