LATE in the afternoon of Thursday, August 21, 1997, my father, Joseph Hamburger, told his secretary, Mrs. Ruth Muessig, that during the following week he would bring her the final revisions for this book. He was in good spirits and seemed as vigorous as ever. Shortly thereafter, he went to Lighthouse Point, where he had often gone with my mother, Lotte, to walk near the entrance to the harbor. Although he completed his walk, he did not return to finish the last revisions for this book or to pursue his other, numerous projects.
Reluctant to modify arguments or to resolve issues my father had left for further consideration, I have altered his manuscript only where clearly guided by his notes or by necessity. Fortunately, he left a manuscript that was almost ready for publication, and therefore his book can now be published in all substantial detail as he had planned it.
—P. A. H.