MicROGRAPHIA) 
becaule feveral of thefe Rays that go to the conftitution of thefe: pulfes 
will be flugged or {topped by the tinging particles E.F,G,H ;, therefore 
there fhall be a féeuxdary and weak pulfethat fhall follow the Ray, names 
ly P P which will be. the weaker: firft, becaufe.it has fuffer’d: maby. re- 
fra@ions in the impeding. body3 next, for that the Rays will bea little 
difpersd or confus'd by reafon ofthe refraction in each of the particles, 
és 
whether round or awgular; and this.will be more,.evident, if we alittle — 
more clofely, examine any one particular tinging Global, 9 
Suppofe we therefore A Bin the cighth Figure of thefixth sebeme, to 
f eprefent a tinging Globule OF par ticle which has agreater refraction than 
the liquor in which it is contain'd ; Let CD bea part.of the pulfe of light 
which is propagated through the containing sedinw;, this pulle will bea 
little ftopt or impeded by the Glebsles.and {o by that time the pulfe iy 
paft toE F that part of it which has been impeded by pafling through the 
Globule, will get but ro.L,M, and fo. that pulfe which hasbeen propa~ 
gated through the Globule, to wit, LM, NO, P Q.,, will always come 
behind the pulfes EF, GH, 1K, &c. ile pee ee 3 
‘ sere theca} 
SED iA 
‘Next, vbyreafoniof the greater impediment in A.B, and its Glabular Fiz 
gure, the Rays that pafsthrongh it wil] be difpers.d, and yery much {cat 
ter'd, Whence C A and DB which before went dared and parallel,will after 
the refraction in A By diperge and {pread by A P, and BQ 5 fo.thabas the 
Rays do. meet with more and more of thefe. tinging particles in their 
way, by fo much the more will the pulfe of light further lage behind 
the clearer pulfe, or/that. which has fewer xefradtions, and. thenec the 
deeper will the colour be; and the fainter the light thas inentjefed. 
through it; for nor onely many Rays are refieéted from the farfaces of 
AB, but thofe Raystbat get through it are very much difordered. 
By shin Bopobefi there isno one,experiment of colour that. [have yet 
met with; but may be, L conceive, very rationably foly'd, and:perhaps, 
had I time to exainine feveral particulars requifite to the demonftration 
of it, Imight prove it more than probable, for all the experiments about 
the howe cea mixings of colours related. in the Treatife of Colours, 
prblifieetiby tbe sinnmnper sb le Madi sndstunlonaieg ss apberasebich 
have obferv'd,.do fo eafily and naturally flow from thole principles,that 
Jam very apt to think it probable, that they own their productionto no 
other feeunddary caufe »|Asto inftanee in two or three experifuents. In the 
twentieth Experiment; this Nob/e Awthour has fhewn that the deep biafh 
purple-colonr of Vielets,may be turn'd intoa Green, by Alealinate Salts, 
and toa Red by acids that is,a Purple confilts of two colours, a deep Red, 
and a deep Blue; whenthe Biueis diluted, or altered, or deftroyd by 
acid Salts,the Red becomes predominant, but when the Xed is diluted by 
Alcalixate, and the Blue heightned, there is generated a Greeny for of a 
Red diluted, ismadeatelom, and Yellow and Binemake a Greens) 
| po ctr oem tra peace enmees teens & : “en 
one follow the clear-pulie; andi the other precede it, it ufually follows, 
that thole:Saline reltnéting bodies which do dilute the colour of the one, 
do deepen that of the other And this will be toade manifelt by al 
regst z io 
