i <066 ) 
Exccrptum ex Jf^dcl Nemoni Epiftola, nuper adEditorera fcript,qua 
ipfe genuinam fuggerit Methodum, doftrinam fuam d tLuc & Co- 
icribHs^ antehac propofitam.evincendi , fubjefta certorum^^y;, 
torum^ debitisExperimcntisfolvcndorum^ feric. 
Lice at mihl hac occafione tibi fignlficAre^ nequaqumcenfere me^ eficacetn 
^afn ejfe determimndx veritatis rationem^qua diiAerfi examinantHr mcm 
dl 5 ^'mbfis Ph^nomem ex f Hear i pofmt , mjt ubi perfeHa fuerit omnium ifio- 
rrm modorum Enumeratio. Nofii^ genmrtam frojnritutes rerum inveftigtindi 
Methodnm ejfe^ qnk ilU ah Exferimmtis dedptcnntur, Ac jam ante tiiidix* 
eram TheoriamameprofofitameviEiammihifHi^e^ non quideni inf c- 
rendorem itafekabere quia baud fe habeac alicer, non earn de- 
ducendo dmtaxat d contrariarum fnpfojitionum eonfutatkne fed ipfarn ab 
Experirnentis, pofitive & direfte concludentibus , derivando. Ve* 
ra it aque ratio earn examinandi h^c erit^ fi confideremm feilicet , nnm Ex* 
ferimenta a mefr&pojita ill as Theorite partes , quibHS accomm^odantHr ^ reve- 
rd probent \ vel fi alia profequamnr Experiment a , quis ab ipfa Theoria ad 
examlnandam earn [uggerantur, At(\ue hoc ipfum Mtthodo genuine fieri ve* 
Urn ^ptrvefiigatisprimHmac determinatis Legibm Rcfradionis, priufqnm 
Color um natara difquiratur. Printer rem itaqtiehaudfore crediderimjif' 
^uifitionem have ex fequentium Quaefitorum ferie infiituer^ -^ ^fia qnidem ut 
d folertihHS fagacihufque 'natunz, Myfips.promnciatis ExperimentofHm Even' 
tibus,dirimaHtfir^invotisqmmmaximehabeo»Eafmt'y 
Primo, Num radii y qui xc[m\i incident in in idem medium incidHnt'^Re' 
fraEiiones haheant inaequales \ quantdque fint refra^ionum^quas ilUfubeHm^ 
injequalitates in quavk incidentia ? " 
, Secund6,^^<c«4»^ ea Lex fity juxta quam radius quilihet magis mtni[vt 
refringitur} fitne^quod idem radim {emper refringatur [ecundum eandem ra* 
tionem Simum Incidentia & RefraUionis ''^ diverfi autem radii , f ecundum 
rationes diver fas f Anveroy quod cujuflihet radii refradtio major minorve 
fit abfqne uHa regula cert a ? Hoc eft, Vtrum unufquifque radins cert urn hA- 
beatgradum Hffrangibilitatis, juxta quern fiat ipfins refra^io • an vero re- 
fringatur fine ifta regularitate f 
Tertio, Num radii, certis gradibus refraHgibilitati^pr^diti, qHandb,que. 
demnm cumque modo Jecernmnur^certos obtineant color es ipfis prcprios 5 put^i 
radii minimi omnium refrangibiles^ C&ccineum maxime refrangibiles^ jQ- 
turum Violaceums intermedii^ /fib -Fir idem alii^ alios ? Et c contra. 
Quarto, Num color <:HjH[vi4 generis radi&rum feorfim txlftentium 
mutari pojfint RefraEiione } 
Quinto, Vtrnm colores coalefcendo revera feinvicem mutenp adprodfi- 
cendumcolorem novum h mvero eum producant nonnifi fe invicem com* 
mifcendo ? . 
^ SeXid, Numdebita radiorum mifcela , omnlgenk cdorum vartetate pr^- 
dha^ Lucem prodmat Solari luci fimillimam'^ quitque tafdem ommno pro-, 
ftietms iihumm^em.mqmthiKmmin^cxhikM^ 
Septimo 
