STOP Early Journal Content on JSTOR, Free to Anyone in the World This article is one of nearly 500,000 scholarly works digitized and made freely available to everyone in the world byJSTOR. Known as the Early Journal Content, this set of works include research articles, news, letters, and other writings published in more than 200 of the oldest leading academic journals. The works date from the mid-seventeenth to the early twentieth centuries. We encourage people to read and share the Early Journal Content openly and to tell others that this resource exists. People may post this content online or redistribute in any way for non-commercial purposes. Read more about Early Journal Content at http://about.istor.org/participate-istor/individuals/early- journal-content. JSTOR is a digital library of academic journals, books, and primary source objects. JSTOR helps people discover, use, and build upon a wide range of content through a powerful research and teaching platform, and preserves this content for future generations. JSTOR is part of ITHAKA, a not-for-profit organization that also includes Ithaka S+R and Portico. For more information about JSTOR, please contact support@jstor.org. STOR Philosophical Transactions Please note: Due to an error in the print volume, the page numbering in this article may contain either page numbering skips, or page numbering repetitions, or both. However, the article content is presented in its entirety and in correct reading order. Please click on "Next Page" (at the top of the screen) to begin viewing the article. ( 40C4 ) A S erie s of QaetQ s propomded iy Mr.lfAZC Nemonj tohe de- termiridky Experimmts ^ psjttively anddireclly eonclvding his new The^ry of Ligbtarid Colours 5 artd here recommendedto the JnduUry ofthe Lovers of Experimental Pbilofophy, as tbey rvere generouflyimparted to tbe Publifber in aLetter of tbe fatd Mr. Newtonsof July 8. 1672» IN the mcan while give me leave, Sir, to infinuatejthat I can- notthink itefiedualfordeterminiDg truth, ro exaniiu th^ fcreral waies by which -Phasnomena may be explained, unlefs where there can be a perfedlenumcrationof all thofe vvaies. You knoWjthe properMethod for inquiring after the properties of things is jto deduce them from Experiments, And 1 told you, that the Theory,which I propounded, ^as evinced ro mc, not by inferring 'ti$ thus becaufe not otherwifc, that is, nat by deducing it only from aconfutation of contrary fuppofitions , but by deriving it f rom Experimeuts concluding pofitively and4ire 4, Whether the colourof any fortof rays aparc may be changed by refradion ? 5. Whethcrcolours by coatefcing do really change one an- cther to produce a ne w colour.or produce it by mixing only . bucif valid , then by provingtheTheory they muft render all Objedionsinvaiid. So far this accurate Tropofer ; whofeMcthod appearing to ba moft genuine and proper to the purpofe it is propounded For, anddeferving cherefore to be confidered and put totrialby Philofophers, abroad as wcll asathomej the Pubhfiier,to inviteandgratifyForrargners, was willing to deliverthea- bove recited Extrgia of iVlr. Nervtoris Letccr in the Idneuage airoofLhcLearuedjasfollowethj Zzzz i " Ex- ( us,dirimantur,in votis quam maximehakeo.Ea funt ; Prirao, Numradii,, qui xqu3i\limidentiainidem mtdium incidunt-^Re- fraBiones habeant insquales ^ quautii^uejint refracHonum ,quas ilUfubeunty insqualitates tn quavis incidentia > Secundo, ^^^nam ea Lexjit, juxta quam radius quilibet magis miniifvs refringitur^i Jitne,quodidem radint femper refringatur fecundftm eandem ra- ttlnem Sinuum Incidentiit, & Refrafiionis '-, diverfi autem radii , fecundiim. rationes diverfas ? Anvero, quod cujufiibet radii refraSlio majer minorve fit ahfque ittia regula certa ? Hoc efi, Vtrum unufquifque radins certum ha- beat fradum Sefrangibi/itatis, juxta quem fiat ipfius refraSiie ^ an verh re- frir.gatur fine ifia regularitate ? Tertio, Num radii, certis gradibntrefrangibilitatis priediti, quando,qH9, dem«m cumque mode,fecernuntur^certos ohtineant colores ipfis proprios ^put/t radii minime omnium refrangihiles, Coccineum j maximerefrangibiles, fa. turum Vielacenm i, intermedii,fub-Viridtm'-j a/ii, a/ios ? Etecontra. Qiiarto, Num coior cnjufvis gtr.eris r^.ditrum feorfim exifientium mutari poffint RefraUione ? QnintO, Vtrnm cotores coa/efcendo revera feinvicemmutent adprodu- cendftm co/o^em novum t an verh eum producant mnnifi ft invicem com- fnifcendo ? Sex;6, NumdebitaradiorHm mifce/a , omnigenace/orumvarietatepra- dita, LHcem producat Sotari /uci fvmii/imam; quxqHt tafdem omnino pr»> frtetates obtir.eat^eadem^He Phtmmcna e.vhibeat f Sepcimd ( 5007 ; Stptimo, Vtrum cmponentef cujufvii mifctU cokres revirkmHtentur \ nnvero feceruatttur duritaxAt^ ^UMidtexmixturA ilUvarii colores rurfum fresiucuntur per RefraFlionem i Oft ivo , Denturne ulli alii colores RefraUione ^roducli prttter ees,