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In the technical portion of the book the author has availed himself of all published information on the subject of the Micro pteri, for which he has given due credit in the proper places. But I desire particularly to express my profound obligation to Prof. Theo. Gill, for permission to use his valuable writings, and like wise to him, Profs. Spencer F. Baird and G. Brown Goode, for information freely given, and for excerpts from rare books in the library of the Smithsonian Institution. I also tender my sincere thanks and grateful acknowledgments to Prof. David S. Jordan, for his uniform kindness, encouragement and advice, for the loan of books, and for the cordial, kindly and courteous interest he has manifested in me and my book.
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