430 
STATISTICS: R. PEARL 
Proc. N. a. S. 
II 
The numerical values of the index (f> for a series of American cities, on 
the basis of the age distribution of the 1910 census are given by way of 
illustration in table 1. The cities are arranged in descending order of de- 
parture from the Lx population. 
The extent of the departures from the standard population denoted by 
the several values of the indices may be indicated graphically by plotting 
the age distribution curve, on a percentage basis, for the two extreme cities 
in the table, Albany and Atlanta, against the Lx population. This is 
done in figures 1 and 2. 
; The general characteristics of an urban population as compared with a 
stationary life table population are well shown in these diagrams. In 
general a city has population under 40 to 45 in excess, and population 
older than that in defect. The reason is obvious. 
TABLE 1 
Showing Age-Constitution Indices of the Population of American Cities 
0 
CITY 
- 10.73 
- 34.91 
- 13.61 
Philadelphia 
- 39.51 
- 17.18 
- 43.35 
- 20.67 
St. Louis 
- 44.57 
- 22.93 
- 48.32 
- 24.10 
Buffalo 
-48.61 
- 24.23 
New Orleans 
-52.44 
- 26 . 62 
- 55.39 
-27.95 
- 62.17 
-29.08 
- 62.54 
- 30.05 
Chicago 
- 68.76 
- 30.26 
St. Paul 
- 68.95 
-31.05 
- 71.77 
-- 31.80 
Fall River 
- 73.39 
-32.19 
-74.42 
- 33.21 
-74.51 
- 33 . 70 
Atlanta 
-82.71 
CITY 
Albany 
Los Angeles . . 
Oakland 
Washington . . 
Cincinnati . . . . 
Dayton 
Indianapolis . . 
Rochester 
Grand Rapids 
Columbus 
Providence . . . 
Cambridge — 
Boston 
Baltimore 
Louisville 
Toledo 
New Haven . . 
Ill 
It will be well to see in detail how the age distributions of some cities 
having nearly the same value for 0 compare in respect of actual age dis- 
tribution of their populations. Table 2 furnishes such comparisons for 
four pairs of cities, covering fairly the whole rank of values of 0 shown in 
table 1. 
From this table it is seen that as we pass from cities having a value of 
(f) of about 24 to cities having 0 equal to about 74 there is a steady change 
from populations having relatively many persons in the higher age groups 
