The title is his own. Herbert Feigl, the provocateur and the soul (if we may put it so) of modesty, wrote to me some years ago, "I'm more of a catalyst than producer of new and original ideas all my life . . . ", but then he com pleted the self-appraisal: " . . . with just a few exceptions perhaps". We need not argue for the creative nature of catalysis, but will simply remark that there are 'new and original ideas' in the twenty-four papers selected for this volume, in the extraordinary a...