AMOUNT OF DIFFERENT KINDS OF PAVEMENTS. Table 55 shows the number of miles and also the relative proportion of the different kinds of pavements in the one hundred and thirty-five cities having a population of 30,000 or over in June, 1901. Notice that the fourth line in the table is "granite and Belgian blocks," and not stone blocks; and therefore sandstone and limestone-block pavements must be included in line 8, which is unfortunate since sandstone-block pavements have substantially the same qualities as granite-block pavements. The last line of the table under the head of "all others," includes sandstone and limestone block, rubble, shell, tar distillate, granolithic, slag block. and perhaps telford—at least Boston, Buffalo, and St. Louis 'usually separate macadam and telford pavements in their official reports. There is a considerable extent of sandstone-block pavements, particularly in the Lake Cities. In 1892, Philadelphia reported 115 miles of rubble pavement (§ 807), which was 14 per cent of all the pavements in that city. Some of the Southern cities have nibble pavements, and several others have streets paved with shells.
Of the 2,061 miles of asphalt pavements, Philadelphia has 289 miles, Greater New York 264, Buffalo 224, Washington 125, and Chicago 103, these five cities having practically half the asphalt pavements reported in Table 55. Of the 1,186 miles of brick pavements, Philadelphia has 128 miles, more than twice as much as any other city. Of the 1,034 miles of cobble stone, Balti more has 321 miles and New York 229 miles, the former being 90 per cent of all the pavements in the city and the latter 13 per cent. Of the 2,020 granite- and Belgian-block pavements in Table
55, New York has 459 miles and Philadelphia 358, no other city having more than 88 miles. The milage of macadam pavements in the five largest cities is as follows: New York 766 miles, Chicago 387, Boston 292, St. Louis 259, and Philadelphia 208. Of the 1,313 miles of wood pavement in Table 55, Chicago has 749 miles (58 per cent of all t1 pavements in the city), and Detroit has 223 (73 per cent of all the pavements in the city), these two cities having 80 per cent of all the wood pavements reported.
Table 56 gives the number of miles and relative propor tions of the different kinds of pavements in two hundred and sixty-two cities having a population in 1890 of 10,000 or Over. Table 56 is given in the same form as Table 55 for convenience in making comparisons. Notice that no brick pavements were re ported separately in 1890. Notice also that the fourth line of Table 56 is stone block, and not granite and Belgian block as in the corresponding line of Table 55. A comparison of Tables 55 and 56 shows that the per cent of asphalt pavements in eleven years increased more than fourfold; and in the same time the per cent of cobble-stone and of gravel pavements decreased more than half, while that of macadam and of wood slightly increased.