( 6li2 ) 
An Anfioer (to the for mr Letter^) mitten to the Tuhlijher June 
lo.id jg. the{ame?arifian VhiUfofher^that was lately faid ta 
have written the Letter already extant in N% 96»p.6c86^ 
TOuchiflg the SolutionSjgivcD by M Newton to the 
fcruples by me propos'd about hisTheory of Co- 
lorsjtherc were matter to anfwer them, and to form new diffi- 
culties ; but feeing that he maintaios his opinion with fo much 
conccrnjl lift not to difpute. But what means it,! pray, that 
he faith 5 Though 1 Jhould Jfjew him^that the White could be produ- 
ced of only twoVn-compounded colors ^yet I could conclude nothing 
from that. And yet he hath affirm'd in p, 308^3 : of the Tranf 
aSions^ that to compofe the White^ all primitive colors arc 
neceffary* 
As to the mannerjwhercby he reconciles the effcft of Con- 
vex glafles for fo well aflemblfng the rays, with what he efta- 
blifhes concerning the dijffcrcnt refrangibility^ I am fatisfied 
with it j but then he is alfo to ackno wkdge^that this aberrati- 
on of the rays is Qotfodifadvantagious to Optic glafles as he 
fecms to have been willing to make us believe, when he pro- 
pofed €oncave (pecHlums as the only hopes of pcrfeding Tele- 
fcopes. His invention certainly was very good ) but^as far as 
I could perceive by experience, the defeft of the Matter ren- 
ders it as Impoflible to execute, as the difficulty of ths Form 
obftruds ihe ufe of the Hyperbole ofM.Dei^Cartes : So that, io 
my opinion^we muft ftick to our Spheric Glaffes^whom wc arc 
already fo much obliged to^and that are yet capable of great- 
er pcrfeftion^as well by increafing the length of Telefcopes^as 
by correi^ing the nature of Glafs it fclf. so far He. 
To this Letter is t^he referrdthat^ which is already txtant in 
N.pS.p.dcS/. m being an Anfwer thereto^, 
A Letter 
