MicROGRAPHTA.” 
lution of the Saffron, by infufing a {mall parcel of it into a great quantity 
of liquor, asin {pirit of Wine, or elfe by looking through a very thin’ 
quantity of the tincture, ‘and which may be heightn‘d into the lovelieft 
Scarlet,by looking through a very thick body of this tin@ture,or through’ 
a thinner parcel of it,which is highly zmpregnated with the tinging’ body, 
by having had a greater quantity of the Saffron diflolv'd ina maller pur- 
cel of the liquor. ae dew io calgfasa 
Now, though there may be fome particles of other tinging bodies that 
givea lovely Scarlet alfo,which though diluted never fo much with liquor, 
or looked on through never fo thin a parcel of ting’d liquor, will not yet 
afford a pale Yellow, but onely a kind of ‘faint Red ; yet thisis no argu- 
ment but that thofe ting dparticles may have in them the fainteft degree of 
Yellow,though we may be unable to make them exhibit itsF'or that power’ 
of being diluted depending upon the divifibility of the ting’d body, if 
1, 3 
am unable to make the tinging particles fo thin as to exhibit that colour, — 
it does not therefore follow,that the thing is impoflible to be done; now; 
the tinging particles of fome bodies are of fuch a nature, that unlefsthere 
be found fome way of comminuting them into lefs bulks then the liquor 
does diflolve them into, all the Rays that pafs throughthem muft necef 
farily receive a tincture fo deep, as their appropriate refractions and bulks 
compar d with the proprieties of the diflolving liquor muft neceffarily 
difpofe ae to emprefs; which may perhaps be a pretty deep Yellow, 
or pale Red. ahs. Of ~ =e Sips ub oe ah 
And that this is not gratis dium, I fhall'add one inftati¢e of thiskind,’ 
wherein the thing ismoft manifeft.° = 
If you take Blue Swalt, you fhall find, that to afford the ccgenare 
which ceteris paribus has the greateft particles or fands; and if you fur- 
ther ‘divide, or grind thofe particles on a Grind{tone, or porphyry ftone, 
you may by comminnting the {ands of it, dilute the Blue intoas pale a one 
as you pleafe, which you cannot do by laying the colour thin ; for where- 
_ Now, there are other Blues, which though never fo much ground, will 
not be diluted by grinding, becaufe confifting of very {mall particles, ve- 
ry deeply ting’d,they cannot by grinding be actually feparated into {mal- 
ler particles then the operation of the fire, or fome other diflolving mex- 
shas reduc’d them to already. bbe idk. 
Thus all kind of Azetaliine colours, whether precipitated, fublim'd, ca]- 
cind, or otherwife prepar'd, are hardly chang’d by grinding, as wlfra. 
marine is not more diluted ; nor is Vermilion or Red-lead made of amore 
faint colour by grinding; for the fmalleft particles of thefe which Thave 
view'd with my greateft Magnifying-Glafs, if they be well enlightned, ap-' 
pearvery deeply ting’d with their peculiar colours; nor, thoughT have 
magnified aid eelighened the particles exceedingly, could I in man “of 
them, perceive themto be tranfparent, or to be whole particles, but the’ 
fmalleft {pecksthat I could find among well ground Vermzlion and Red- 
lead, feem'd to bea Red maf, compounded of a multitudé of lef and Sef 
motes, which fticking together;compos'd a bulk, not onéthoufand ‘thou- 
fandih part of the fmalleft vifible fand or mote. And 
