: MIGRATION AND BUSINESS CYCLES
Male Immigration.
The course of male immigration during the war and post-war
period and, for the sake of comparison, a few of the pre-war years,
is shown in Chart 23. The curve in this chart represents the
CHART 23
Mare IMMIGRATION: 1910-1924.
Three-month moving average of index, adjusted for seasonal variation,
with base 1910=100
ZO a Ee
yf
160+ Na
¥ hi:
120+
ir
106; Ny
*)
I =
wk =
OT] 1911 | 1912 | 1913 | 1914 | 1315 | 1316 i 01a | 199 | 1920 | 1921 | 1922 | 1523 | 1924
sNumerical data in Table 30.
changes in the numbers of those officially recorded as male immigrants,
 after adjustment has been made for the typical seasonal
variation. The tendency for the quota law to concentrate the
greater part of immigration in the months of July to November
required the computation”of a special seasonal correction for the
years beginning in July, 1921, in order that the curve as shown
might be free as far as possible from mere seasonal fluctuations.

126