flow. Mean time yaii may fcc,thait if theft Experimeots <fe> 
fuccccd, it can no more be laid, that all the Colors are oeceia* 
ry to compound White, and that 'tis very probable^that all the 
reft are nothing but degrees oiTellom and Ekw y more or leis 
charged. 
Laftly, touchiogthe Effeftof the different RcfraftioDs of 
the Rays in Tclefcopical Glafles, 'tis certain, that Experience 
agrees not with what Mr. Newton holds* For to confider 
only a pifture, which is made by an qbjea-glafe of ^^ feet io 
a dark room, we fee, it is too diftin^t and too well defined to 
be produced by ray es,that fliould ftray the 50#i&* 
part * of the Aperture- So that, (as I believe ^^J!''^ 
I have told you heretofore ) the difference of ton faith in 
the Rcfrangibility doth not, it may be, alwaycs ^h,^\»m' 
follow fthe lame proporiioo m tne great and 307^/^ 
foiall inclinations of the Rayes upon the furface 
of the GlafJ* 
ldr.iitvjtot\% Anjhertotheforegoiwg LeUer further es^iaming 
his Iheory^ rf Light and Colors ^ and particularly that of Whit 
nejs'^ together with hM continned hopes of perfeSfing telefiopef 
ij Refle3ions rather than RefraSkns, 
Concerning the bufinefiof Colors^i in my faying that 
when Moiificur N/hath fliewn how White may 
be produced out oftwo uncompoundcd colors,! will tell hiroi 
why he can conclude nothing from tiai^ my meaniog was^, 
that fuch a White, f were there any fuch^) would have diffe* 
rent properties from the White, which! had relpedl tOj when 
I defcribed my Theory, that is^ from the White of the Sun^s 
iinmtdiatc light , of theordinary objt&s of our fenfes, aiidi 
of all white Phenomena thzt have hitherto fain under my obj* 
fcrvationv And thofe differeot properties would evince it to 
be of a different cord-tution .• Infomuch that foch a produai- 
on oflvhite would be fo far from contradiding, that it would? 
rather illuftrate and corificm my Theory becaufe by the dif- 
ference of that from other whites k would appcar^that othcm 
Whites are not compounded of only two colours 3ike that. 
And therefore if Moofieur M would prove any thiogjjit it re* 
qulfite that he do not only produce out of tw0 primitive €b^ 
