XXVI
THE IMMIGRATION PROBLEM
is called particularly to this feature of the book. There
should be noted also the colored diagram taken from
the last Report, 1912, of the Bureau of Immigration,
which gives by races, in very compact form, the statis
tics of immigration into the United States from 1820
to date.
Altho the Reports of the Immigration Commission
—especially, and naturally, the abstracts—form the
chief basic material for this work, in a good many
instances facts are given or opinions are stated for
which no specific authority is cited. Both authors of
the book themselves worked for four years directly
upon this investigation; and in consequence they have
felt justified in giving facts on their own authority
which have not elsewhere appeared in print.
It has not been possible in every case to give credit
to all the individuals taking part in collecting or pre
paring material for the Immigration Commission on
which some of the chapters are largely based. Both
authors had an active part in directing the work.
In a number of cases special credit has been given at
the beginning of a chapter to the experts of the Com
mission who were especially active in collecting or pre
paring material. Besides those should be mentioned
Dr. Joseph A. Hill, who supervised the work on occu
pations and the fecundity of immigrant women; Pro
fessor H. A. Millis, who had immediate charge of the
investigations on the Pacific Coast; Dr. E. A. Golden-
weiser, who had special charge of the investigation of
congestion in large cities; and W. W. Husband, secre
tary, and F. C. Croxton, chief statistician, who had
general supervision of the work of the Commission.
In the Report of the Immigration Commission, due
credit is given to the experts doing special work, many