MIGRATION AND BUSINESS CYCLES 
to make use of them. More details of its construction are given 
in the following paragraphs. 
The Estimate for Massachusetts. 
An examination of Chart 9 will aid in following the process used 
in constructing the estimate of factory employment in Massa- 
chusetts. The fragments of curves in the lower part of the chart 
CHART 9 
ILLUSTRATION OF METHOD OF ESTIMATING FACTORY EMPLOYMENT 
IN MASSACHUSETTS: 
550 ~ 
Sou IN 
30, wr 
ton A ) ra NN 
339 a 
Sow Siig 
S250 . 2 
3 oa 7 = CENSUS 
5, 200 | 
2 Fe," ESTIMATE 
S150 
2 AN = SAMPLE 
100 
50 
0 Z889 1690 | 1851] 1692 | 1893 | 1894 | 1895 | 1896 1899 | 1900 1903 | 1904 
sSee explanation in accompanying text. 
represent the unadjusted data for numbers employed in identical . 
establishments. Each fragment is twenty-four months long and, 
for the second twelve months, runs substantially parallel to the 
succeeding fragment. The upper curve on the chart represents the 
revised estimate of factory employment in Massachusetts obtained 
by (1) splicing the fragments together at the December points which 
are common to two fragments, and (2) raising the resulting index 
to make it consistent with the complete enumeration of the Census 
years. 
The black circle for 1899 represents the Census average for that 
9See Table 15. 
70)