The decisive influence of Friedrich Nietzsche on H.L. Mencken is readily acknowledged in the vast literature on the great American journalist and social critic. However, Mencken's 1908 study of the philosopher has been relegated to footnote status by Mencken's critics and biographers and has been largely ignored by Nietzsche scholars. There are good reasons for reversing this judgment. Mencken's work was one of the first comprehensive and sympathetic treatments of Nietzsche's thought in the English language. It is a provocative engagement with the German philosopher's complex and elusive...