: 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 im- 
migrants, 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