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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 76, page id 1677894601:0252
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Chymists obserre, that Vesitables (25 Lavender, Rue,
Marioram, 1c.) distilled per se, betore termentation
vield OyIS Without any burnins Spirits, but acter fer-
mentation rield ardene Spirits ithout Oyls: Which
Ches, thattheir OyI is by fermentation converted into
Spirit. Ther And alco, that it OyIs be poured in smalt
quantier upon termentatins Vesetables, ther distil over
alter fermentation in the Form ot Spirits.
Sothen, by the Foregoins Table, all Bodies Peem to
have their retractire porreis proportional to theu
densities, (or very nearly;) excepting (otar a5 ther
Partake more or less ot Culphurous oyiy particles, and
therebr hare their retractire porver made sreater or
lels. Whence it seems rational to attribute the retra-
ctire porrer oFall Bodies chieAtr, it not wholly, to the
Culphurous parts rith irhich ther abound. For itS
probable thât ail Bodies abound more or less with Sul.
Phurs. And as Lisht consresated by a Burnins:sla(s
acts most uxon Culphurous Bodies, to turn them in-
to tire and Aame; (0, since all action is mutual, Sul-
phurs oushit to act most uxon Light. For that the
action betreen Light and Bodies is mutual, nay appCaF
Trom this Consideration, That the densest Bodies irtrich
retract and reflect Lisht molt stronsly grour hottest in
the Summer-Sun, by the action of the retracted or re-
Aected Lighe.
I hare hitherto explained the porrer ot Bodies to re
Dect and retract, and Thewed, that thin transparent
plates, tibres and particles do, according totheir tereral
thicknesles and densities, retleet sereral lorts ot raYS,
and thereby appear ot leveral COlours, and by conte-
quence chat nochins more is requisite For producins ald
thC