f 6o89 )^ " 
inay make it al(b appear of a white color exaftly like A. Xfiem^ 
at a convenient diftance view thefe two whites through a 
Prifffljand A will be changed into a ferrcs of all colors. Red; 
YclloWjGreen^ Blew, Purple, with their intermediate degrees 
fucceeding in order from B to But ct, according to the a- 
forefaid Experiment 5 will only yield thofc two colors of 
which 'twas compounded^ and thofe not conterminate like 
the colors at BCjbutfeparate from one another as at^and ^, 
by means of the difFereot refrangibility of the rays to which 
they belong. And thus by comparing thefc two whites^ they 
would appear-to be of a different conftitutioDj and A to con- 
fifl: of more colors then a* So that what Monfieur IST, contends 
for, would rather advance my Theory by the accefsof anew 
kind of white than conclude againft it, * But I fee no hopes 
of compounding fuch a white* 
As for Monfieur Wbis^expreifion^that I maintain my dodrine 
with fome concern , I confefs it was a little ungrateful to me 
to meet with objeftions which had been anfwcred before, 
without having the leaftreafon given me why thofc anfwcrs 
were infuffieient* The anfwcrs which I fpeak of are in the 
Tranfaaionsfrom;?4g. 5093 to/?^^. 5102* And particularly in 
pag^ 5095 5 to (hew that there arc other fimplc colors bcfides 
blew and yellow, I inftance in a fimple or homogeneal Green, 
fuch as cannot be made by mixing blew andtyellow or any t)« 
ther colours. And there alfo I (hew why , fuppofihg that ail 
colors might be produced out of two, yet it would not folr 
low that thofe two are the only Original colors. The reafons 
Idefireyou would comparc with what hath been now faidof 
White. And fo the neceffity of all colors to produce White ^ 
mighthave appeared l)y theExperiment/^ifg.SojijjWhere I fay, 
that if any color at theLw be intercepted, the whireneii - 
(which is compounded of them alU will be changedinto (the 
refultof) the other colors* 
However, fincei there fecms to have happened fome mif- 
underftandiog between uSj. I (hall endeavor to explain royfelf : 
a little further in thefe things according to thc foJlowiog me- 
thodi^ 
* 
