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COPYRIGHT 1916 BY THE JOHNS HOPKINS PRESS

PRESS OF
THE NEW ERA PRINTING COMPANY
LANCASTER, PA.

PREFACE

This monograph had its origin in an investigation carried on by the author while a member of the economic seminary of the Johns Hopkins University. The chief sources of information have been the trade-union publications contained in the University library. Documentary study, however, has been supplemented by personal interviews with tradeunion officials and with employers.

The author wishes to express his appreciation of the helpful criticism received from Professor J. H. Hollander and Professor G. E. Barnett.

L. W.

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