(J^VATVOR LENTIVM. 229 



quam dedrudlio colorum iridis poftulat , ia hac ae- 

 quatiouc conrcntam : 



F -i- iP + il^' — <3 ^^11 bq— M-~<2 — e — M+i~-g ^M-O 



idcoque e^ = l^H^^^lt/^ -»] , vnde inuenitur 



, M {q-c-'n)(2-q-+ -ti} {,-q)f.m-i-{i^q ] (.-:—2q-^-c)Vl-h{'- —qy, {q~c} 



^ q ' i 2-2q-f.C-+-jK q{2 — iq^c-i-^n) 



quem valorcm oportct eflc maiorem vnitatc, fi qiii- 

 dcm c pofitiuc accipiatur, Euidcus autcm eft fra- 

 dioncm q uotabilitcr maiorcm capi d^bere , quam 

 c-\-M, quia aiioquin fradio q—c-zTn ficrct nimis 

 magna , vnde etiam fradio b q^—^ i ^c proptcixa in- 

 teruailum AB enormitcr augcretur. 



9. Ne igitur hoc cucniat , atque vt ob mi- ^ig- 4« 

 nutam fradioacm q etiam campus amplictur , con- 

 vcnict fracflioni c valorcm tribui ncgatiuum fmiul- 

 que fumi b <^ i , cx quo fbrmulae nolirae erunt : 



/ ^■'^ ^/ '"^ M /// bc_ M 



. T, J>i Tfr- t((.-6 ) 7-<-c ) M r-n__^(irh£i^ - 



et pro loco oculi DO — r~iirrx-p'''' At vt iri- 

 dis colores euanefciint, ticri dcbct £> = -+ - — -^,:^ „,- , 

 qucm valorem vnitatc minorcm cffe oportet , quod 

 in affutritione nunuri c probc e[\ obfcruandum ; fi- 

 mul vcro ctiam vt ^^— M pofitiuum prodcat , 

 quorum vtriimqne poliulat , vt c notabilitcr minus 

 quain 2-2<7-i-2M accipiatur. Interim tamci-v ob 

 ^<i fumi oportet ?>M, quod ob M fradioucmi 



F f 3 eo 



