as great a difficulty in the Number of Coburs^ you will lee 
hereafter. 
But whatever be the advantages 
J / -1 *. o- * j,L r 6i^itt itismt mcefCitry. H limit w 
or difadvaatages of this Hymbeff, ^^^^^ ^ ^^^Jl ^/'^^^ ^^^^ 
I hope I may be exculed from ta- thefis. 
king it upj fincc I do not think it 
needful to exph'cate my Doftrine by any Hjpothefis at all For 
iiLigh becoofiderd abftradtedly without refpeftto any Hy- 
fothep^ I can a/ ealily conceive, that the (everal parts of a fbt- 
oiog body may emit rays of differing colours and other quah's 
tiesj of all which Light is conftituted, as that the feveral parts 
of a falfe or uneven ftring, or of uneavenly agitated water in 
a Brook orGatara<9:, or the fe yera! Pipes of an Organ iiifpis 
r^dail atonce^ or all the \rariety of Sounding bodies in the 
world together^fhould produce founds of feveral Tones^ and 
propagate them through the Air confufedly inrermixt. And, 
if there were any natural bodies that could refieU founds of one 
tone, and ftifle or tranjmit thofe pfanotheri^^then, as the Echo 
ofaconfufed Aggregat of all Tones would be that particular 
Tone, which ihe Echoing body is difpofed to reflect 5 fo^fince 
(even by the Animadverfofs conceffions) there are bodies apt 
to reflect rays of one colourj and ftifle or tranfmit thofe of ane- 
ther ; I can as eafily conceivej that thofe bodies, when illumi- 
nated by a mixture of all colours, muft appear of that colour 
only which they refleca. 
Bat when the Objector would infinuate a drflSculty in thele 
thingSj by alluding to Sounds in the firing of a Mufical inftru. 
ment before percuffion^or in the Air of an Organ Bellowes be- 
/ore its arrival at the Pipes ; I muft confefs, I Mnderftand it as 
little, as tf one had fpoken of Light in a piece of Wood before 
it be fet on fire, or in the oyl of a Lamp before i$ afcend up tlis 
match to feed the flame. 
. You (ee therefore, hovi^ much , „^ , . r , \ - ^ 
. : 1 /-J 1 I r / • 1. J 7. ThedttncnititS of the kmmmytr^ 
ft IS befades the buhnels in hand, i^.^ .^ifconrfe uhflmUcd fro^ 
to difpute about Hypothefes, Foar pothefes, mimnfida d mov& £em-<- 
which reafon I (hall now in the ^^^^^^ 
laft place,prGceed to abftradi: the 
difficulties in the Amimadverfor s difcouirfe, and, without having 
regard to any Hypothe^s^ confider them in general teim^.^jAnd 
they may be leduced to tfaefe i^^res : L 1 1 11 i 
