This is the most complete English edition of Kant's correspondence that has ever been compiled. The letters are concerned with philosophical and scientific topics but many also treat personal, historical, and cultural matters. On one level the letters chart Kant's philosophical development. On another level they expose quirks and foibles, and reveal a good deal about Kant's friendships and philosophical battles with some of the prominent thinkers of the time: Herder, Hamann, Mendelssohn, and Fichte.