Plut. _Nic._ 23 (R. P. 148 c). Cf. _Per._ 32 (R. P. 148). Driven from his adopted home, Anaxagoras naturally went back to Ionia, where at least he would be free to teach what he pleased. He settled at Lampsakos, and we shall see reason to believe that he founded a school there.[674] Probably he did not live long after his exile. The Lampsakenes erected an altar to his memory in their market-place, dedicated to Mind and Truth; and the anniversary of his death was long kept as a holiday for school-children, it was said at his own request.[675] Footnote 674: See the account of Archelaos in Chap. X. § 191. Footnote 675: The oldest authority for the honours paid to Anaxagoras is Alkidamas, the pupil of Gorgias, who said these were still kept up in his own time. Arist. _Rhet._ Β, 23. 1398 b 15. [Sidenote: Writings.] 125. Diogenes includes Anaxagoras in his list of philosophers who left only a single book, and he has also preserved the accepted criticism of it, namely, that it was written “in a lofty and agreeable style.”[676] There is no evidence of any weight to set against this testimony, which comes ultimately from the librarians of Alexandria.[677] The story that Anaxagoras wrote a treatise on perspective as applied to scene-painting is most improbable;[678] and the statement that he composed a mathematical work dealing with the quadrature of the circle is due to misunderstanding of an expression in Plutarch.[679] We learn from the passage in the _Apology_, referred to above, that the works of Anaxagoras could be bought at Athens for a single drachma; and that the book was of some length may be gathered from the way in which Plato goes on to speak of it.[680] In the sixth century A.D. Simplicius had access to a copy, doubtless in the library of the Academy;[681] and it is to him we owe the preservation of all our fragments, with one or two very doubtful exceptions. Unfortunately his quotations seem to be confined to the First Book, that dealing with general principles, so that we are left somewhat in the dark with regard to the treatment of details. This is the more unfortunate, as it was Anaxagoras who first gave the true theory of the moon’s light and, therefore, the true theory of eclipses. Footnote 676: Diog. i. 16; ii. 6 (R. P. 5; 153). Footnote 677: Schaubach (_An. Claz. Fragm._ p. 57) fabricated a work entitled τὸ πρὸς Λεχίνεον out of the pseudo-Aristotelian _de plantis_, 817 a 27. But the Latin version of Alfred, which is the original of the Greek, has simply _et ideo dicit lechineon_; and this appears to be due to a failure to make out the Arabic text from which the Latin version was derived. Cf. Meyer, _Gesch. d. Bot._ i. 60. Footnote 678: It comes from Vitruvius, vii. pr. 11. A forger, seeking to decorate his production with a great name, would think naturally of the philosopher who was said to have taught Euripides. Footnote 679: