ACKNOWLEDGMENT

IN THE preparation of this volume the publishers have received from several houses and authors generous permissions to reprint copyright material. For this they wish to express their cordial gratitude. In particular, acknowledgments are due to the Houghton Mifflin Company for permission to reprint the sketch of Horace Greeley; to Little, Brown & Co. for permission to reprint passages from "The Life, Letters, and Journals of Louisa May Alcott"; to Mr. Henry George, Jr., for the extract from his life of his father; to William H. Rideing for permission to reprint extracts from his book "Many Celebrities and a Few Others"; to the Macmillan Company for permission to use passages from "The Making of an American," by Jacob A. Riis; to Miss Helen Keller for permission to reprint from "The Story of My Life."