( 5086 ), 
tiqaes; yet I muft for this as well as other confideratio n pxt 
f er them in the Theory before Refractkm. 
Whether the Parabola hQ tnpre difficult to defcribe than the 
Hyperbola or Ellipp, mzy he z ^^re : But I fee noabfolute 
necefiity of endeavouring after any of their defcriptioos. Eor, 
if Metals can be ground truly Spherical, they will bear as great 
Apertures^ as I believe rnen will be well able to communicate 
an em^tpoWh to. And for Dioptrigue Telefcopes, I told 
you, that.the difficulty confifted notio theFigureof the glafs, 
but in the Difformity of Refradions : Which if it did nor, I 
could tell you a better and more eafie remedy than the ufe 
of the Gome SeSions^ 
Thus much concerning' the Vrastique 
jt. of ih nmlguK p^j.^ of Optiqucs. 1 Ihall now take a view 
of theCoDfidera^idns'onmyT/;^/^/. And 
thofe confift in afcribingan Hypothefs to me, which is not mine,- 
in AfTerting an which, as xo the principal parts, is 
Kot againft me ^ in Granting the greateJft part of my difcourfe 
ifexpHcatedby thatH;';?^?^^/?/^, and in Denying fome things, 
the truthof which vroulxi haveappear'd by an experimental 
examination* 
Of iheil Particulars r fhall difcourfe in 
tXn^^t^' "''' order. And firft of ihe Hy;«.*#. which 
is afcribed to me in thele words : >5«^^r5«^ 
his frfl [uJ}pofitiQn^ that light is a bbdy^ and that as many colours or 
degrees as there m^y be^ fo many bodies there may be ; aS tvhich cojn' 
^ pounded together would mahe White^ &cc. ThiSj it feems, is taken 
fcr my HypQtbefts. Tis true^ that from my Theory I argue the 
^(?r/>(?m/y of Lights but Ido it without any abfolute pofitive- 
nefs, as the word perhaps intimates 5 and make it at moft but a 
very plaufible confequeme p£ the Dodtrine^ and not a funda- 
mental Suppojitiouy nor fo much as any part ofit 5 which was 
wholly comprehended in the precedent Pr opoficions,. And I 
fomewhat wonder, how the Objector coxxlA, imagiDe, thatjwhea 
I had afferted the Theory with the greateft rigour, I fcould 
be fo forgetful as afterwards to affert the fundamental fuppo' 
fitioD itfelf with no more thao a/?^r^dt^/,. Had I intended any 
iach Hypotheps^ I fliould lome where have explain* d it. But I 
knew, that the ^r^/?^m>iP, which I declared oi Lipht^^'^c^^ 
