[10] The passage I have quoted above from Schopenhauer's letter is also to be found among the letters published in my book, "Arthur Schopenhauer. Von ihm, über ihn, u. s. w.," p. 541 _et seqq._, and it results from this, as well as from several other letters which likewise deal with important and knotty points in his philosophy, that this correspondence may perhaps not be quite so worthless and unimportant as many--among them Gwinner, in his pamphlet, "Schopenhauer und seine Freunde" (Leipzig, 1863)--represent it to be. This pamphlet of Gwinner's, by the way, has met with the treatment it deserves in the Preface to the collection, "Aus Arthur Schopenhauer's handschriftlichen Aphorismen und Nachlass. Abhandlungen, Anmerkungen, Fragmente." (Leipzig, 1864). I have thought it advisable to give this passage of his letter, as being relevant to the matter in question. As to the division in chapters and paragraphs, it is the same in this new edition as in the last. By comparing each single paragraph of the second with the same paragraph of the present edition, it will be easy to find out what has been newly added. In conclusion, however, I will still add a short list of the principal passages which are new. List of Additions to the Third Edition. § 8, p. 13, the passages from "_Notandum_," &c., to "_Ex necessitate_," and p. 14, from "_Zunächst adoptirt_" down to the end of the page (English version, p. 14, "_Not._," &c., to "_Ex nec._"; p. 15, from "First he adopts" down to the end of the paragraph, p. 16, "_est_ causa sui"), in confirmation of his assertion that Spinoza had interchanged and confounded the relation between reason of knowledge and consequent, with that between cause and effect. § 9, p. 17, from "_er proklamirt_" down to "_gewusst haben wird_." (E. v., § 9, p. 19, from "He proclaims it" down to "by others before.") § 20, p. 42, in speaking of _reciprocity_ (_Wechselwirkung_), from the words "_Ja, wo einem Schreiber_" down to "_ins Bodenlose gerathen sei_." (E. v., § 20, p. 45, from "Nay, it is precisely" down to "his depth.") § 21, p. 61, the words at the bottom, "_und räumlich konstruirt_," down to p. 62, "_Data erhält_," together with the quotation concerning the blind sculptor, J. Kleinhaus. (E. v., § 21, p. 67, the words "and constructs in Space" down to "of the Understanding,") and the note. § 21, pp. 67-68, from "_Ein specieller und interessanter Beleg_" down to "_albernes Zeug dazu_." (E. v., § 21, p. 73, "I will here add" down to p. 74, "followed by twaddle.") § 21, p. 73, _sq._, the instances of Caspar Hauser, &c., from Franz, "The Eye," &c., and the physiological corroborations from Flourens, "_De la vie et de l'intelligence_," &c. (E. v., p. 80, and following.) § 21, p. 77, the parenthesis on the value of calculation. (E. v., p. 83, "All comprehension," &c.)