' t 171 ) 
nuf^ Gmdaiiom^ th^t the dilFereace of thofe ihn are nigher 
to the Top , from the Superior of all 5 is my little (md 
therefore cannoc make fo confiderable a difference 
hi the view of the pans of an Objed:^ but from thofe that 
are further off great enough , and the difference of the 
higheft fibres fromthe lovvefl , greateft of all, Befides I 
would have it obferved that 'tis the different tenlton of the 
Thdami Optioz ^ and not fo much a varying Expanfionof 
them in the Eye, that makes the difference» For as the 
Eye difcerns an Objed more by the inward than outward 
€oneof Vifion : fothe*So/// inay be well fuppofed tojiidg 
.of or difcrimmate things abroad ^ not fo much by the ^^wi!:** 
y^ard part of the fibres inferred in the Organ^ as by the tti" 
mard that terminate zhom the commou Sefjj 'ory in the braia 
und more immediately affcfl her, 
8. WhcreasI mention fometimes the paraMifme of the 
;Gorrefpondent fibres> I mean it not in a ftn£lM^^^^;w^- 
4kal Senfe\diS 1 partly hintedat the latter end of chat Effay,} 
but only their being as it were in w^mlibrio or due poife in 
l€fpe£l of their fituation ; and therefore if thofe fibres had 
i>€en ftraight f and not of a Curvd figure > as they are) I 
fliould have rather chofe to have expreft my mind by the 
I ptarafc qf Mmhemmkians ^ of their being i/2 mdem piano. 
I Jut my fenfc being urrderftood there need not be any ex- 
j ception to ikt word, fince it was rot fb eafy to ej^prefs 
I my meaning by a better ^ and therefore I lhall pals by this> 
and proceed to mor^ real objeftions that have been fenc 
me by Mr. Nemton ousr worthy Prof, of Mathematicks ^t 
Cambridge fand other frieads J relating to the Opinion it 
felf. 
The I. ObjecSion was made in the R. S, whenit was ob/ea^ 
readth«re> which(asl was told> was this; vi^. That it 
feem'd difBcult to conceive how thofe foft Medullary Fibres 
I j .of the Nerve could have fuch a tenfiofi. But this is not hard- 
cr to conceive than in that of a Spiders-Web^ whofe Mu'^ 
cousfubjlance and Expan/ionvetY well anfwers to that of the 
I 
