r soii j 
as great a difficulty in the Number of Coiburij as you will fee 
hereafter. 
But whatever be the advanta0:e$ ^ ^ 
or difad vantages of this Hypotbep, Hypo^ 
I hope I may be excufed from ca- thc{^$. 
king it up, fince I do not think it 
needful to explicate my Doflrineby any Hypothejls at all, Foi' 
li Light beconfider'd abftradtedly without refpeft to any Hy" 
pothefisy I can as eafily conceive, that the leveral parts of a Ihi- 
oing body may emit rays of differing colours and other quali? 
tiesj of all which Light is conftituted, as that the feveral parts 
of a falfe or uneven ftrfng, or of uneavenly agitated water in 
a Brook orGatara<ft, or the feveral Pipes of an Organ infpi-- 
redall at once, or all the variety of Sounding bodies in the 
world together5fhouId produce founds of feveral Tones^ and 
propagate them through the Air confufedly intermixt. An4 
if there were any natural bodies that could refleU founds of one 
tone, and flifle or tranfmit thofe of another v ^then, as the Echo 
of a confufed Aggregat of all Tones would be that particular 
Tone, which the Echoing body is difpofed to refledl 5 fo^fincf 
^even by Animadverfofs conceffions) there are bodies apl 
to reflect rays of one colourj and ftifle or tranfmit thofe of anc« 
ther ; I can as eafily conceive, that thofe bodies, when illumi« 
nated by a mixture of all colours, muft appear of that colour 
only which they refle<3:. 
Bat when the Objector would infinuate a difficulty in thefc 
thingSj by alluding to Sounds in the ftring of a Mufical inftru. 
meot before percuffion,or in the Air of an Organ Bellowes be« 
foreits arrival at the Pipes 5 ImufI: Gonfefs, I underftand it as 
little, as if one had fpoken of Light in a piece of Wood before 
it be fet on fire, or in the oyl of a Lamp before k afcend up the 
match to feed the flame. 
\ You fee therefore, how much ^ , , * • j 
• • f ./-J i_ L r / • u J 7. The dt^cult I of the kmmmva'* 
It IS befides the bufinels in hand, ahftraS d fr.^ H>- 
to dilpUte 2ho\XX.HypOthefes, For pothefes, and mnfidn'd mmg^fii^ 
which reaion I (hall now in the "^^^'^^ 
laft place,proceed to abftraft the 
difficulties in the Animadverfor s difcourfe^ and,withoot having 
regard to any Hypothefis, confider them in genera! term?. And 
they may be reduced to thefe i^^res: L\\U i.Whet 
