PREFACE This study was begun as one of the several researches of the Bureau of Social Research of the New York School of Philanthropy, largely at the suggestion of Dr. Samuel McCune Lindsay, the director, to whose interest, advice and sympathy its completion is largely due. Sincere thanks are due the Bureau for making the investigation possible. The material was gathered between January, 1909, and January, 1910, except about four weeks in... more...