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102 De Arati Canone. Canonis ter meminit Achilles Tatius in Prolegomenis Arateis. Primum^ postquam Aratum docuit noluisse in Phae- nomenis de planetis agere, quippe hoc deprecatum vs. 460 his verbis^ OvKeri OapaaXeo^ Keivcov eyco apKio^ elriv airave(i)v rd re KVKa tcl t aiOept arjfxar evicnreiv^ addit Achilles; UapaiTeiTm ^e Sid TroXXm airia^' irpivrov oTi (paivojULeva rjOeXtjae Kal Traai avix(pcova del^m aarpay ovTOL Se TToXXi^v ^lacpwviav €')(ovcn Kal ov^e iracnv elcrl (pavepoi' ev he TM €7rLypa(pofJ.€V(p avTov kuvovl tov irepi avTo)v ttol- ov/UL€vo^ Xoyov dpjuovia tlvI Kal au^tpwria ixovctikyj Tctj KLVYjaei^ avTijov Xeyei yeyovevai. Hoc repetit paulo post^: irepl Se Ttj^ evapjmoviov Kivrjaeco^ avrwv (twp eVra crtpatpcov) eiTrei/ m €(prjv 'AjOaro? ev tm Kavovi Kal * EparoaOevrj^ ev tw 'Epfxrj Kal *Y//i/cX^9 koi 'Acpaaros 't(ppoSiaLev^' T^p^avTo he tov Xoyov tovtov o UvOayopeLOt' irdvTa yap dpfxovia Kal Td^ei Xeyovai KLveiadai. Et mox : rioXXoJ Toov eiTiCpaveaTepcov irepl rjXiov Kai aeXrjvrj^ eirpay- luaTevaavTOy Icia ce Kal irepl tcov Trevre* clo Kai Aparo^ iSiw^ fxev irepl yjXlov Kal aeXi]vr}^ ttjOo? tm TeXei Trjg iroiYjcrem elwev;, ihia he ire pi twv irevTe ev tw eiriypacpofxevap KavovL. Sed magis diserte libri hujus argumentum eloquitur index ejus in vita Matritensi^, Kavovo^ KaraTofxri; superest enim praeclarus libellus Euclidi tributus, qui inscribitur Ka- TarofXYJ Kavovo^^y superest in Theonis Smyrnaei libro, quern de musica scripsit, caput ^"^ irepl t^9 tov /cai/oi/09 KaTaTo/mrj^ e Thrasyllo maxime petitum; unde constat canonis sectionem, canonices musicae opus, nihil esse aliud nisi musicorum certi alicujus systematis sonorum in monochordo designationem, quae secundum longitudinem chord arum instituatur. Jam vero qui harmoniam sphaerarum exponendam susceperit, ei canonis sectione opus est : sicut Thrasyllus et Theo Smyrnaeus canonis sectionem eo consilio proposuerunt, ut ex ea Platonis psychogoniam indeque aptum sphaerarum concentum expli- carent; et quem Achilles Tatius ut Aratum in Pythagorica ilia sphaerarum harmonia tractanda versatum esse dixit. ■' C. 15. 6 c. 16. ' C. 19. 8 T. II. p. 442. ap. Buhl. ^ In septeni Musicis Meibomii, post Euclidis introductionem harmonicam. ^« C. 35.