C 599 ) 
“ deceived in his Experiments, by Reafon of the Bad- 
<c nefsof his Prifms which he had from Venice” ; but 
this is but a partial Acknowledgment of his Error, and 
only fatisfadory to fuch as have not read his Book, and 
are like wife unacquainted with Sir Ifaac Newton ’s 
Opticks. For Signior Rizzetti in the 37th and 38th 
Pages of his Preface has thefe Words <c TJt fiiofbiet 
<c oculos confidant^ omnes quidem pojfunt me a Ex - 
“ ferment a iterare ; at fiprimo intuitu deficit , qui 
* expefdatur , eventus fiatimme falfitatis non ar- 
<c guant {ut vir Celebris dicitur nimia feftinatione 
* feciffe') ; fiedfrius omnes meorum exferimentorum 
<l limit at tones notent : Si ad has enim attenderint • 
“ non f ingui Minerva, non trigonis imperfettis [ut 
“ alu dittitant\ fed accurata diligent i a, & infra - 
u mentis idoneis me in hujufmodi res incubuiffe etiam 
« adverfarii, vet inviti fate bunt ur”. As to Sir Ifaac 
Newton’s Experiments, a great many of thofe which 
Signior Rizzetti calls in Queftion may be performed 
with very ordinary Prifms: And of that Sort are thofe 
which I made fince the Publication of the Book in the 
Beginning oflaft Auguft , at myownHoufe, before the 
Prelident and feveral Members of the Royal Society, and 
fome foreign Gentlemen. But before I give an Account 
of the Experiment?, I beg Leave to quote fome of 
Signior Rizzetti’ s Expreffions againfl Sir Jfaac New- 
ton, otherwife I may be thought guilty of the very 
Fault which I have laid to his Charge. ^ 
Preface, Page 13. “ Miratus fum quod acutiffimus 
« Newtonus ignoraverit Lumen album aider a 
tl Trigono , & aider a lente differ gi’d Who ever 
read Sir Ifaac Newton’s Opticks, that can be of this 
Opinion, except our Author ? Preface, Page8r. - 
“ Thcoria 
