1 “...THIS ESSAY was begun a long time ago, in 1962, when I spent a year in Rome on a Guggenheim...”

2 Table of Contents: “... Mary Helen -- XIV Guggenheim Fellowship, Half 1930, Half 1932 -- XV Back to the University of Chicago...”

3 “... and research appointments include a Fulbright Fellowship, a Whiting Fellowship, a Guggenheim Fellowship...”

4 “... the George Pólya Prize in applied combinatorics, the Guggenheim Fellowship, and the Leroy P. Steele Prize...”

5 “.... The recipient of a Guggenheim Fellowship and a member of the American Academy of Arts and Sciences, he...”

6