and death rates and the immigration and emigration figures; it has been well proved that this is a determination capable of close approximation.
Eerimmateo PopuLaTion or THE CoNnTINENTAL UNITED STATES
(In thousands) Year Jan. 1 June 30 1909 89,557 90,370 1910 91,340 92,229 1911 93,070 93,811 1912 94,500 95,338 1913 96,290 97,278 1914 98,310 99,194 1915 99,870 100,428 1916 101,080 101,722 1917 102,410 103,059 1918 103,660 104,182 1919 104,310 104,847 1920 105,709 106,381 1921 106,821 107,785 1922 108,533 109,184
Unfortunately there are no good statistics as to the total number of workers in the country except. the census figures, and there are no good statistics at all as to the classification of workers. For 1916, a year that was about midway between the two census years, there were conflicting estimates from official sources. The Public Service Reserve of the Department of Labor estimated the total labor power (men and women) in the United States in 1916 at 40,100,000. The Provost Marshal General, on the basis of the first selective draft in 1917, estimated the total working population at 43,282,911. In February, 1919, a total of 43,206,912 was estimated.
An examination of the estimates for 1916, with the aid of collateral data, led me in my former monograph to adopt the following figures as the most probable
