MicROGRAPHTAs 93 
rent colours: Thus the Ca/x of Silver tinges the: Glafs on which it is ane 
eal'd witha lovely Yellow,or Gold colour,cc. 5 > * 1 WwOED 101s 
And that the parts of Metals are tranfparent, may be fartherargued’ 
from the tranfparency of ‘Leaf-gold, which held againft the light, both 
to the naked eye, andthe A“ficrofcope, ‘exhibits'a' deep Green. “And 
though I have-never feen the other Metals Jaminated fo thin, that I was 
able to perceive them tranfparent, yet, for'Copper and Brafs, if we-had: 
the fame conveniency for /awinating them,as we have for Gold,we might} 
perhaps,through fuch plates or leaves.find very differing degrees of Blue, 
or Greens for it feems very probable, that thofe Rays that rebound from 
them ting’d, with a deep Yellow, or pale Red, as from Copper; or with 
a pale Yellow,as from Brafs, have pait through them ; for I cannot con- 
ceive howby reflection alone thofe Rays can receive a ‘tinctute, taking 
any Hypothefis extant. - . | Parts 
So that we fee there may a fufficient reafon be drawn from thefe in- 
fiances, why thofe colours which we are unable to dilute to the paleft 
Yellow, or Blne,or Green, are not therefore to be concluded not to bea 
deeper degree of thems fer fuppofing we had a great conipany of {mall 
Globular etience Bottlesjor roundGlafs bubbles.aboutthe bignefs of aWal- 
nut, fill'd each of them witha very deep mixture of Saffron, and that 
every one of them did appear of a deep:Scarlet colour, and all of them 
together did exhibit at a diftance, a deep dy'd Scarlet body. It does not 
follow, becaufe after wehavecome nearer to this congeries,or mafs,and diz 
vided it mto its parts, and examining each of its parts feverally or apart; 
we find them to have much the fame colour with the whole mats} it’does 
not, I fay, therefore follow; that if we could break thofé Globules {maller, 
or any other ways come to fee: a fmaller or thinner parcel of the ting’d 
liquor that fill'd thofe bubbles,that that ting’d liquor muft always appear 
Red, or of'a Scarlet hue, fince if Experiment be made,the quite’contrary 
will entues,for it is capable of being diluted into the paleft Yellows? ' 
 Now;that I might avoid all the Objections of thiskind, by exhibiting 
an Experiment that might by ocular proof convince thofe whom other _ 
reafons would not prevail with, 1 provided me a Prifwiatical Glaff,, made * 
hollow, juft inthe form of a Wedge; fuch as isreprefented in the'tenth 
a of the fixth Scheme, The two parallelogram fides ABCD, ABEF, 
Which met.at 'a‘point; were made of the cleareft Looking-glafs plates well 
ground and ‘polifh’d that Pcould getsthefe were joyn‘d with hard cement 
tothe triangnfar fides, BC E, A DF which were of Wood 5 the Parallelo- 
grambafe BCEF, likewife was of Wood joyn'd onto the reft with hard 
cement, andthe whole 'Prifizatical Box was exattly ftopt every where, 
but onely alittle hole near the bafe was left,whereby the Veflel could be 
fill'd with any liquor, or emptied again atpleafire? >" a lO Yaa 
_ One of thefe Boxes (for had twoofthem) Ifillf'd with a pretty déep 
tincture of ‘dives, drawnvoneély with fair Water, and then ftopt théhole 
with a piece of Wax, then:by holding this Wedge againft the Light, and 
looking throtighit, it was obvious enough to fee the tincture of the liquor 
near the sdgeof the Wedge: where it was but very thin; to be a pale oa 
Bioniod M we 
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