MicrocroarHal 
faferai points of any'Object asto collect themsdgaif;and uhitethem! each; 
inacdiftinct pomt,and that onelysthofe Rays which dome from: forte poitit 
that. lies in the Ax#s | of theo kigure producid;care fo laccuiatély! tes 
fratedtto one and the fame point again, and that thedateral efuri 
ther they are remiov‘d,  themore impentect;is theitibefracted confinence’s 
It follows therefore, that onely the Picture.of thofe-parts.of the external 
objects that lie'in, or neer, the Ax#s Of each Hebiifp ene, ate difcernably 
painted or made onthe Aetiva.of each Hemilphere, and thatstherefore 
i 
eachof them can:diftinctlyfenfate-or fee onely:thefé parts svhich arevery 
neer perpendicularly eppos'd to ity: Or li¢.im-ormeer! its bptick vixir 
Now,:though there:may. be-by -eachiof thefe:eyé-pearlsja’ reprefentation 
to:the:Animal ofa whole Hemi/phere in'the fa pesmermertad nce een 
thereis a picture’ or fenfation inthe; Retiva of-allithe objects lying almoft 
inan'Hemifphere 5 yet, as ina man’s.eye alfo, there, are: but:fome: vert: 
few:ipoirits which liyng in, or eet, the. optick, «4xéare diftingtly dif 
cern; So there.may, be multitudes. of Pictures;made of am Objechin | 
the: fevera] Pearls; and yet but one,|or fomeweryfew that are difting’s 
The reprefentation of any object that ismade inany other Pearl, but that 
which is directly,or very neer:ditectly,oppos d,being altogether confis'd 
and unable to produce a diftinét,vifton. »:iho22%9 Jom od ss 
»»Soithat we a that thougl: it has, pleas'd: the! All-wife Creator; to!in- 
due this creature with fuch rouleitades of eyes, yet:hasihe notlinduedit. 
with the faculty of: feeing more:then’another-¢reatiine; ifonwhéreasthis 
cannot move his head,at leaft.can. move itvery-dittle;without moving his 
whole body, bioew/ar creatures can in: an’ inftant Cor the tminkling-of um 
eye, which, being very quick, is vulgarly ufediinsthe fame ifignification) 
move their eyes fo.as to direct’ the! optick Axis;t0 any points nor'is it 
probable, that they, are able tofee attentively at one time more then one 
Phyfical, point 5 for though there: be a diftint Image made in every eye; 
Yet,‘tis very likely,that the obferving faculty; is only,imploy’daboutfome 
(1d 2996010) Tei 
riiiitt a WA 4 
One Ob ject for which they havemoftconcern. 3)o:)) 1. 211). 
Now, as we accurately diftinguifh the fice-or-pofition of an, Objet 
by the motion of the Mutcles of the eye requifite to-put the optick Line 
in.a'direct pofition,and confufedly by the polition ofthe imperfect Pidture 
of the object at the bottom of thé eyes fo are thele eruftaceows creatures 
able tojudgeiconfufed|y of the pofition of objects by the Picture,or im- 
preflion made at the bottom’ of the oppofite Pear],,and diftintily bythe 
removal of the attentive or obferving facultys.from one Pearltoanother, 
but what this faculty is,as it requires another place, fo a much deeper {pe- 
culation. Now, becaufcit were impoflible,even with this multitude of eye- 
balls,to fee any object diftin&t(for as I hinted before,onely thofe parts that 
lay in,or veryneer,thé optick'Lines could befo}cheYafinitely wile Creator 
has not left the creature without a power of moving the head a little in 
Aerial cruftaceows animals,and the very eyes al{o in cra/taceows Sea-anittials, 
fo that-by thefe means they areinabled to direct. fome optickdineor other ; 
t . ie 
againft any objedtand by that means. they have the vifive faciulty'as cont! 
leat. as any Animal that.cam: moveits-eyes. io .disea Upmi to wo1 > 
Siser ngs B Diftances 
b 2 
\ 
ayy 
