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PREFACE TO FIFTH EDITION
xxi
available for use until the time of the next United
States census, with the addition of a special appendix
covering any new legislative changes that may be
made.
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 Commis
sion 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. Gold-
enweiser, who had special charge of the investigation
of congestion in large cities, and W. W. Husband,
secretary, who has written also chapter ..... and F.
C. Croxton, chief statistician, who had general super
vision of the work of the Commission.
In the Report of the Immigration Commission, due
credit is given to the experts doing special work, many
of whom, on account of their number, it would not be
practicable to enumerate here, but whose work has
been freely used.
Due credit should also be given to the Commissioner
General of Immigration for the use of statistics from
his annual reports and two diagrams showing immi
gration into the United States from 1820 to the pres
ent time.
The authors wish to acknowledge their indebtedness
to Miss Elizabeth A. Hyde and Mrs. Franklin W.