New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1850-11-30
HUMAN VISION
A LECTURE,
By PROF. EDWARD sKoTT, of NETWORK
Reported for The Tribune

II,
lecture on the Anatomy and Physiology Of the
Human Eye and on the and abuse OF specta-
ces, at the Society Library, Broadway, last
evening. Hecommenced by taking general view
Of the Science Of Critics not dipping deep into the
subject, but merely considering such laws as bore
on the poiat-the investigation of light and color
and their relation to the organ Of vision. He OBJ
served that it was an extensive branch Of Natural
Philosophy, and would require many lectures, ii
Adequately illustrated The Prof next proceeded
to describe the anatomical formation of the Eye,
commencing with its various coats, and ending
with the Transparent Media. He remarked, in
describing the Cornea, that it was most beauti.
fully pellucid membrane situated on the front sur.
face Of the sceretc, aud SO firmly connected to it
tbat they were considered one and the same
that more minute investigation had demon
strated their texture and conformation, and had
fully proved the fallacy Of this position The
Cornea he stated was formed of strong fbrous
LAYERS, which were superadded upon each other,
and these were generally six in number, and
were connected by cellular tissue, which formed
many like cells between eacher layer; these con-
tanned transparent fluid sccreted by many
minute and colorless exhalent vessels Such is
the admirable contriyance that renders this firm
and dense structure permeable to the rays of
light The description OF the crystalline lens was
thus given The crystalline lens is most
beautifully clear and transparent body, sit.
uaed on the surface Of the vitreoQs humor
embodied, as it were, in its substance 1t
is surrounded by a most beautifully peIlucld
tbi, enrronndi,,6 ,,orts serves in some degree
r.foir tho crysfalina lens in lis DroDer nosirioD
he olsostated that the crvstaIfne ems was iouby
convex; and this was more marked on its front sur
foco than nm the hack and that il consisted of con-
c435,rc coote con,nosad of 6bras and increased in
deneitv from its circumference to ifs cenier for
fhe nurpose Of correcting lis spherical alteration
Tba odnponq a,d vitreous humour4 were next
mentioned rs being media of ref.acton. for assist
inc in producing images on the retina The Eve
INV in his MONT of view be regarded as an opt
col s+r,I,,,rt and nc fbn ac of different trans
na~o+ media ON thc rays of ljght may be calcu
Iofed n1atbnInaticall, t6a density and c0ufgpra-
tor, of tho media of the eve being clearly given
80 +Io Jr-lo m he tho most delicate and bean.
r. - - II pl,r 81. s,,5,i-a
tllGl Ui5aIi III t50 u','til nj - 7..s NV.
az '"l'q"5 va SP1et1I - - - H. ~, of
take Oh l1,' 6eheial ~ NV o'i s
tl'e anih"I s'e ~ - Il i,1st[,
'''' u ~ " - ~, lao4;,Sla r,o,-,r Ny
ana 'lNs l0'SG7 }i,, f ,,.,or obects
as me rays ol HSu1 = o So, fJa
require yne "io.e ~ VI. a., ~ f I,nir
perfect W W. eo'ir etoe - ~ - -,
ON the fetha' 1t loiio"s VI 1ou ~ 81. ~ e..
rye III It's altered stute nav lI5 io't 's ~ ~ -
I iractlye power, can 0hly parEiaHy confpi6o NJ
divergent rays SO Ina1 lucy SUM- to nG' 3-
lore they are orongnt 10 POM o t o nj u ' 4
convey az lilip9lt1I sn.Ie " w. 49,: -
LiiLu' Ii0Nee ii "a - fot a rntI, in
tleauIn5 a diie 1900, a,, ;,to hiScts
uis'f 'n 'r l, rs.1nca of
Iioo' 5"f - ~ - " ,a,,,a3 tl iT1,idDal
tiS uoicNI NV - ,a IL. 4b, Of
whose slbnt Is So ti'eci " W 9oo IN ~ t;
1ect OF which, II properly aPPIGq :" ~ ei!o. w
you nave mere an e. ~ 10 ~,
power btIllS Tue sdiiiC 40 Vnnt ~ U''T 'V
in us perfect slaie' NO" PatlH6 u' -
ca9dle' you WIN see PeiieoU ili5 Z VI 'i,o -
on Ihe retlha. On Ie coiiItti - i'' ~ az
artlhclh rye Ibltu up WIN IiansP"IGnV pa 70 %
less power OF bending rays oil ilSht thaA Una. OF
The natural rye Wheh IN lts perfect slaIe' auu 1nc
effect is as we Shall seei the image OF the can
die VIII be seen on the retlna OF TINS Eye very
ndlstlnCtly. Now to exhibit TO you tii9 eueCt Vi
spectac!es when properly applied nave avs. mere re,
speotacle-giass the retroactive po"ero "atG ca auu-
ed to the diminished reractve po"et on lials oil
tlhclSI i-St' '5 9 ~ 10 - ~ Ill defnad
-! e VH"s - ouo " ,TL;a, f ~ Iac+nra
MAJ ~ nv 80 L,4 ,lo +lo ,o1als were
" "a 49, 80 ~ a1 noi,,ad The prof won't
~ 80 Tlls So, The ,,ybla aiIact ol nro
/ vi '"9 ~ ' ~ - - a. +;,da 10
uuriii5 ss'G o ,I}g far we render the
~ 80; ia,'4 e+ot al t1o ossistonre re-
=! =, " 40 D - 80 4I G,,t;C,,s of ,,is
- ~ &c ri ~ ma mo os tLis
~ II :; - 1j H. 10 ,asiaet 49, in rho
a. - oc' ~ " 80 ~ IL ~ etI,a31i tho
"V''o ~ sun ~ y" i''i : i : -: 10
natural rye possesses Ic pow q u $50
70 see through 5l"SSes VI NolouS 1o So " 80 10
nyhg power, ana as mere ID ouC 0c Vi I IuoSo'
!hat "ouo asslsI le wye Wl.n4 4s - 800 ~