MiicROGRAPHIA. 
moft all kinds of Purples, and many forts of Greens, both thefe colouts’ 
éonfifting of mixt colours for if we fuppofe A and A in'the ninth Figure, 
to reprefent two pulfes of clearlight, which follow each other at a con- 
venient diftance, AA; each of which hasa {prions pulfe preceding it, as 
BB, which makes a B/ve,and another following it, as CC, which makes 
Red, the one caus d by tinging particles that have‘a greater refraction,the 
other: by others that have a lefS refra@ting quality then the liquor or 
Menftruum in which thefe are diffolv’d, whatfoever liquor does fo alter 
the'refraction of the one, without altering that of the other part of the 
ting’d liquor, muft needs very much alter the colour of the liquor 5 for 
if the refraction of the difolvent be increas'd, and the refraction of the 
tinging ‘particles not altered, then will the preceding furious pulfle be 
fhortned or ftopt, and not out-run the clear pulfe fo much; fo that BB 
will become EE, and the Blue be diluted, whereas the other {purious 
-pulfe which follows will be made to lagg much more, and be further be» 
‘hind AA than before, and CC will become f f, and fo the Telow or — 
Red will be heightned. She | 
A Saline liquor therefore,mixt with another ting’d liquor,may alter the 
colour of it feveral ways; either by altering the refraction of the liquor in 
which the colour {wims: or fecondly by varying the refraction of the co- 
loured particles, by uniting more intimately either with fome particular 
corpufeles of the tinging body, or with all of them, according as it hasa 
congruity to fome more efpecially, or toall alike: or thirdly, by uniti 
and interweaving it felf with fome other body that is already joyn’ 
with the tinging particles, with which fubftance it may have a ¢ongruity, — 
though it have very little with the particles themfelves : or fourthly, it — 
may alter:the colour of a ting’d liquor by dif-joyning certain particles _ 
which were before united with the tinging particles, which though they 
were fomewhat congruous to thefe particles, have yet a greater congruity 
‘with the newly znfus'd Saline menftruum, Ye may likewife altet the co- _ 
Jour by further diflolving the tinging ‘fubftance into fmaller and fmaller 
particles, and {0 diluting the colour 5 or by uniting feveral particles toge- _ 
ther as'in precipitations, and fo deepning it, and fome fach other ways, 
which many experiments and comparifons of differing trials! together, 
might eafily inform one of. | at ani iv ioe | 
» From thefe Principles applied, may be made out all the varieties 
of colours obfervable, ‘either in liquors, ot any other ting’d bodies; with 
great eafe, and I hope intelligible enough, there being nothing inthe 70- _ 
tion of colour, or in the fuppos'd production, but is very conceivable, 
v The greateft difficulty that I find/againft this Hypotbefs, is}: thatthere 
feem to demore diftinc& colours:then ha intone ellowand Blue. 
This Objettion is grounded on this réafon, that there are @veralReds, 
which diated, make not a Saffron or pale Yellow; and*therefore Red,or 
Scarlet ifeemsto bea third colour diftiné froma deep degree of Yellow. 
~ Towhich I anfet, that Saffron affords us a deep Scarlet tin@ture,which 
‘tay be'diluted intoas pale.a Yellow as any; either by making a weak {> 
S203t7 5 Jution 
