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His book is the result of long and patient investigation. It was with a view of satisfy ing the author's own mind that these studies were begun, and with no Intention of writing a book. Many large libraries have been gone over, and a somewhat extensive correspondence conducted. Many of the books quoted are exceedingly rare, and many more locked up in foreign languages, and it occurred to me that these authorities might be of service to those who have neither the time nor Opportunity to investigate so large a range of lit erature. I am under obligation to many friends who have assisted me in divers ways. I cordially mention my lifelong friend, Prof. Arthur Yager, Ph. D., of Georgetown College, Ky. He was especially helpful in translating French and German authors.