For the love of all that is decent, I don't know why "Further Reminiscences" hasn't been combined with "The Star Diaries" to make one handy volume. First of all, thdestinction is essentially artificial - "Further Reminiscences" contains two journeys which were dropped, for one reason or another, from the American edition of the Diaries, a selection of Earthside "reminiscences", a short called "Doctor Diagoras", and the fantastic "Let Us Save the Universe", all of which were present in the original Polish edition. Even the books' sizes favor an omnibus re-issue (250 and 150 pages, respectively).
The two "new" journies found in this book are the eighteenth and the twenty-eighth. The 18th is essentially a shorter, more readable version of the 20th (found in the parent volume), and the classic, oft-reprinted 28th deals with personal freedoms (the Phools and the Master Machine that was created to mediate their conflicts - and thus decides to refabricate them in stone to stop their chaotic quarrels).
The five "further reminiscences" are essentially humorless essays, each dealing with a specific philosophical idea. In each, Tichy comes into contact with some sort of scientific visionary (be it Corcoran, Decantor, Zazul, or Molteris), and, after ascertaining that they aren't insane, listens to their wild stories: Corcoran constructs mechanical brains whose lives and fate are mere recordings in a large steel drum; Decantor wants to immortalize the soul by encasing it in crystal; Zazul tells the gruesome story of his attempt to clone himself; Molteris produces a functional time machine, and, without examining the possible consequences, tests it on himself. It is apparent that these were written at the same time as the journeys, since the 20th has a direct reference to Molteris. "Doctor Diagoras" is not a certified "reminiscence", although it is essentially identical in spirit, the topic of debate being artificial intelligence (the fifth reminiscence is very similar to the 11th journey, only in reverse and with more legal issues).
The volume closes with "Let Us Save the Universe", which is a detailed petition to conserve intergalactic flora and fauna, with several quite hilarious examples of how we foul up the planets, and how some species manage to retaliate.
In a nutshell? A worthwhile read - far from a worthwhile purchase.