OF BODIES.Chap.XXXI. 



feftly for a blacke ; in the firft, betwecne the two white edges ; 

 and in the fecond , limiting the two white ends : and by coufc- 

 quence } the ayre about the candle muft iikewiie fervc for two 

 blackes, including the light candle berwecne them. 



Sevcrall other delighfiill experiments of luminous co/ours I 

 might produce, to confirme the grounds I havelayd,for the na- 

 curc and making of them. But I conceived that thefe I have 

 mentioned,are aboundantly enough for the end I propofe unto 

 my fclfe : therefore I will take my leave of this fuppleand nice 

 fiibjedt ; referring my Reader ( if he be curious to entertaine 

 himlelfe with a full variety offuch fhining wonders)toour inge- 

 nious Countrcyman, and my worthy friend, Mr. Hall : who at 

 my laft being ar Liege,mewed me there mort of the experiences 

 I jiairement oned ; togetherwith feverall other very fincand 

 remarkable curiohties concerning light^which he promifcd me 

 he would ihortly pubji h in a worke,that he had already caft and 

 aimoit hr.iOied upon that iubje& : and in it, I doubt not but he 

 will give entire iatisfadliou to all the doubts and Problems that 

 may concur in this iubje : whereas my little exercife formerly. 

 in making experiments of this kind , and my lefle conveniency 

 or attempting any now, makcth me content my lelfc with thus 

 ipinning ot a courie thred from wooll carded me by others, that 

 may rurne through the whole doctrine of colours, whofe caufcs 

 ha e hitnerto been fb much admired : and that it will do fb,! am 

 ttrongly periwaded botiibecaufe if I look upon the caufes which 

 I have aliened * yw> i, me tlnnkes they appeare very agrecab'e 

 to nature and to reafon ; asd if I apply them to the feverall 

 Phxnomens which Mr. Hall shewed me. and to as many others, 

 aslhaveotherwife met with, I findethey agree exactly with 

 them and render a full account of them. 



And thus, you hare the whole nature ofluminous coi'ours,re- 

 iblved into the mixtion of light and darknefle : by the due orde- 

 ring of which ,who have skill therein , may produce any middle 

 colour he pleafeth : as I my ielte have feen the experience of in- 

 finite changes in fiich (brt made ; fb that.itleemeth unteme, 

 nothing can be more manife/t, then that luminous colours are 

 generated in the way thacis here delivered. Of which how that 

 gentlc,and obedient Pniloibphy of Jt*litus (readily obedient 

 to what hard taskc ioever y OH aifigne it) will render a rational 1 



account; 



