TITVLVS LXIXInuentores citant̉ oīm aſtronomiā inueniſſe: Zoroaſtrenqꝫ dicūt alijaſtronomiæ (latonē ſecuti) deorū īmortaliū hanc nobis dono cōpe-riſſe. Alij uero inquiſitiōe diligētius inueniſſe. Ptolemæūaūt admirant̉: ꝗ poſt tot annos tā egregie ſit ī illis uerſatꝰ& doctrina & rerū exꝑientia: quæ uix ij primi attigiſſent.HomerusHomerus aūt & aſtrorum curſus: & menſuratione: numeros: harmonicaſqꝫ deſcribēs aliqn̄ cōſonātias: uix ſibi cre-dat in ſumma rerū oīm difficultate cū dicat ſine teſtibꝰ ꝓ-bationi fidē adhibendā. Ego & ueterū & noſtroꝝ ī his fa-cultatibꝰ cōſiderās laudes: uolutāſqꝫ nōnunꝗͣ mecū animoquāti fuerint: ſintqꝫ aſſidue præſcij ꝗ poſſunt ex ijs funda-mentū & ueritatē elicere: qui ſunt oīm obſcuriſſimi: & ad-miror & ueneror: ſi quos ītueor eiuſmodi mathematicos:q uera ſint laude digni. Puto em̄ hæc aut ꝓuidere: aut ri-mari: non tam hūanitatis officiū eſſe: ꝗͣ potius diuinitatis.Ꝙͣobrē cū iſtic quo te mi fili diſcendarū miſi bonarū artiūgratia: factꝰ ſim certior mathematicū eſſe uirū nō officio-ſum minꝰ qͣꝫ ingenioſum: hoc eſt & doctiſſimū: & bonorūamātiſſimū: ad eū te cum hac epl̓a cōferas cōtinuo uelim:ip̄mqꝫ meo nomīe roges: tibi ſeſe nōnunꝗͣ diſciplinas ſuasimpartiat̉: ſed ea quidē ſollicitudine qua ſolet amicos. Nācū nulla tibi ſint ijs in artibꝰ principia: eſt inchoandū a characteribus (ut aiunt) ut facilius ad calcē peruenias. Id ſi tibicōmodaturū ſe ꝓmiſerit: intelliget ꝓpediem nō cōtuliſſeofficiū in ingratū. Nā ut meapte ſum natura in eos omnisliberaliſſimus qui me aliqua donant gratia: ita in huiꝰ ope-rā conabor ſuperare mea & naturā & conſuetudinē: ne ſeunꝗͣ iactet me uiciſſe officijs decertantē. Eſto tu modo ſtudioſus. Ex Mediolano Idibus lunij.¶ Iynonyma mathematicalia.Doctiſſimus hic eſt arithmeticus.Acutiſſimus eſt aſtronomus.Diligentiſſimus eſt geomēter.Sonorus & ſuauiſſimus eſt muſicus.Huic ſunt cæli ſecreta cognitiſſima.