( 4?4 ) 
& per Prifma vitreum trigonum tranfmiflum, coloremque 
violaceum fpatium majus quam trium linearum occupan- 
tempercrenam duarum linearum traje&um, alio Prifma- 
te excepit admodum oblique oppofico : quo fa&o quan- 
dam ejus partem in Rubrum & Flavum tranfmutari obfer- 
vavit. Similiter luminis rubri partem in cosruleum & vi- 
olaceum tranfmutari expertus eft. Hac vero tranfmuta- 
tione admifta corruere Theoriam Newtonianam, ex A<ftis 
A. 1 706. p. 60. & feq manifeftum eft. Aflumpfit autem 
Mariottus diftantiam 30 pedum, nequis exciperet in mi* 
nori diftantia nondum fadtam efte plenariam radiorum 
heterogeneorum feparationem. Nobis experimentum 
Marictti turn demum videretur decifivum, ft lumen coe- 
ruleum integrum in aliud mutatum fuiftec. Thus far the 
Editor of the A<fta. In anfwer to which it is to he obferved 
that the Red and Itllow which came out of the Violet , and the 
Blew and Violet which came out of the Red, might proceed from 
the very bright Light of the Sky next encompaftng the Sun , 
and that feveral forts of Rays which come from fever al Parts of 
the Suns Body are intermixt in all parts of the coloured Spe- 
(ftrum which falls upon a Paper at any Di (lance from the Prifm . 
In this manner of trial , for making the Experiment fucceed \ 
the Light of the bright Clouds , immediately furrounding the 
Sun, jhould be intercepted by an opake Skreen place din the open 
Air without , at the difiance of Tenor Twenty Foot from the 
Hole through which the Sun (bines into the dark Room.- And in 
the Skreen there Jhould be a (mall Holt for the 
through . The Hole may be either round or oblong, and not 
above one eighth or one. 'tenth Part of an Inch vroadl; < jo ' that 
the Skreen may intercept not only the lright r Lighl‘ isfl'thi 
Clouds next encofttpajfing thl Siin's Body, but alfo thegreatefi 
Part of the Sun s slight. Fob thereby the Colours will become 
lefs mixed . The Beam of Ughrdhidh fii(fes tbrougv thh Hole 
mufi afterwards pJjs 1 hr ought heothch Hole 'into the dark Room , 
and the Prijmmft be placed par fid ih the oblong Hole in the 
Sheen 
