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INTRODUCTION
libraries, which I shall always associate pleasantly with their respective librarians. Mr. F. H. Waterhouse and Mr. Edward Heawood.
I have, also, had reference to such books as I wished in the British Museum.
To Mr. Quaritch I owe publication on a scale which would never have been attempted by myself alone; nor carried into being but for the loyal collaboration and able direction of his assistant.
THE AUTHOR
