Some Southern statisticians, while admitting these indubitable figures, contend that the South is improving at a much more rapid rate, and hence must in no long time overtake the North; but it must be remembered that in most of these fields of comparison the North not only shows from two to two and a half times the output, but that its annual or decennial increase is absolutely larger than in the South; that is, that the annual amount which the South must add to its present output, in order to catch up with the North, is larger than it was a year ago, or at any previous time. A conventional explanation of this state of things is that the Negroes constitute a large part of the Southern working force, and are much below the average of Americans in their productive output; but when comparisons are made between similar aggregations of white population, results are not very different. If the whole South (including the District of Columbia) be compared, not with a block of about 28,000,000 Northern people, but with a block of about 18,000,000 white people corresponding to the 17,900,000 Whites in the South (both figures for 1900), the results are still startling; although the South has all the advantage of the labor and production of 8,000,000 Negroes besides the Whites. The debts of the Southern communities in 1902 were 374 million dollars; of the Northern, 301 millions. The total taxes raised in 1902 were: South, 116 millions; North, 202 millions. The estimated Southern wealth in 1900 was 16.7 billions; in 1904, 19.8 billions, an increase of 3.1 billions; in the North the corresponding figures are 25.8 billions and 31.4 billions, an increase of 5.6 billions. The Southern assessed valuation of 1907 was 8.5 billions, of the Northern group 10.7 billions.