The Paternity of Abraham Lincoln: Was He the Son of Thomas Lincoln? An Essay on the Chastity of Nancy Hanks:

From the PREFACE. A large portion of this volume was written before the author realized that it had begun. In the preparation of his former book, "The Soul of Abraham Lincoln," the author undertook a painstaking study of Lincoln's successive environments, which involved, incidentally, inquiry into his heredity. This latter aspect was of secondary interest, nor was the author greatly interested at the beginning in the various theories which he encountered as to Lincoln's paternity. While he ...