Weekly national intelligencer. [volume] (Washington [D.C.]) 1841-1869, 1852-09-11

the writer may be- he has certainly proved his claim 10
whatever honors the French Academy may fit to ex
tend to NJ AsDRAUD The latter gentleman is wrong and
his error is clearly detected, and the experiment
shown by the real dscovere the clerical
of the Delta.
The best manner of detecting the globules is with
ens though the perforated hole shows an interesting
spectacle The iris Of the eye also superby magnied
and rendered beautifully visible with two lens small
and large placed FIVE feet apart the larger one di-
reced TO the moon or lamp, and looking it with the
smaller finch focus placed close to the eye Indeed the
experiments may De varied produce the finest ef
ec' AZ once novel and beautiful Next to telescope
view OF the heavens Iknow nothing in science so interest
ing and at the same time simple as this seeing the
interior OF the eye" with the eye itself The Rector Of
o. JOINS parsonage has conferred philosophical treat
upon expermeners In physical science by his discovery
trusting that my friend, the editor Of LIE Courier des
Etats Unis, will notice the article which have sent Won
BY giving the extract insertion, remain gentlemen.
yours respectfully, BrAuyoar
| FROM THE NEW ORLEANS DELTA
The following interesting communication from a dis
tnguished literary gentleman and excellent clergyman Of
the Episcopal Church fail to arrest the attention
Of the curious optics We have ourselves verified the
experiments herein recorded and noticed one fact which
correspondent does alude to- VIZ the image of
friend who was standing and at certain angle
with our retna, projected from that nervous expansion
as it were into the panetks Disc where it resembled
the face in The sum- see it printed in childish books
The communication may be headed, "The Art Of See
ing the Interior Of the Eye with the organ itself
! TO the Editors Of The Sunday Delta
GENTLEMEN have recently read in Of the jour-
mails statement in relation late discovery said to
nave been made by NJ Andraud, eminent French en-
gneer The paragraph to which Iaude reads follows
Some attention has been excited by alleged discovery
by French engineer Of celebrity named Andaud, Of
of seeing the air. IT. says he you piece
card cooed black the size Of the eye pierce wba
fine needle hole in the middle you will looking through
that hole clear sky lighted lamp see multitude Of
molecules floating about which molecules constitute the air.
We shall whether the theory will obtain sanction of the
Academy Of Sciences to which has been submitted"
My object in drawing your attention to this extract is
in order correct important error touching NJ An
drauds alleged discovery.
The atomic globues which rendered visible to NJ
Andraud by of the perforated card aerial
molecules have been, for months past familiar
with this interesting experiment The beautiful gobules
seen by means of the hole in the card the atomic
cooress globes which constitute the crystalline fluid -
the eye. NJ Andraud supposes they external and in
the air. when the truth is they Internal and within the
chamber Of the eye.
The experiment may be tried and the fact verified by
person, in the following Take thick visit
ingcard and black it with ink, piece of pasteboard
opaque enough forbid the transmission Of light through
it, and perforate the centre with pn-hole Place the
card between the eye and candefame, globeamp,
4
distance from the light but this distance will vary accord
ing to the conyexity fairness of the eye who
must adjust it till he finds his focus Instead Of seeing
the fame Of the candle the beholder now dscerns cir
cular disc the size Of the iris of the eye This disc is
bright and panetlike, and is crossed by innumerabe
lines like the fbres visible the surface of magnifed
rose-leaf 1t appears be beyond The eye between the card
and the light and it is this illusion which deceived NJ.
Andraud, and led him to suppose that he portion
Of the atmosphere magnfed But this visible disc is in
fact spherical section of the uida crystalline lens with
ls,l cln
cenated pencil Of light passing from the candle into it
through the minute hole in the card and the veined APP
pearance of its surface is the reculated ad of the
dnary transparent of the rendered visible
The chamber Of the eye thus lighted up the intense
line Of light passing into through the minute vrce,
(which acts as strongly magnifying lens there is
veyed to the optic image EXACTLY the size Of the
pupil through which the ray passes of circular section
Of the crystalline fud with its atomic particles intensely
magnifed The spectacle is of surprising wonder
and beauty Myriads Of illuminated molecules distinct
ly appear in remulous motion in the bright fluid Of
them simple globes others encirced by two
concentrc rings like exquisite miniatures of the
planet Saturn, through telescope. Some Of
them transparent like infinitely small soap bubbles,
and float about lightly while others are of the white
color Of pearls
BY contracting the eye by gently moving the head
from side to side these beautiful millions Of globular
atoms made to unduate within the chamber Of the
eye, and change places ascending and others de-
scendng while others thrown the focus Of the
light dart the disc like shooting stars in lesser
1
of infinite diversity.
The experiment is q highly interesting well
philosophical one, and will well recompense whoever
attempts il. II will require some practice in tyro to
adjust the card to the proper focus as to obtain the
clearest DISC but any who knows how TO use mi
croscope will easily discover when the card is in focus IL
the of the candle is through tilt out Of focus
and it must be advanced drawn back until round
planet-ke shape is dscernible. This panetike shape
which win appear crossed by network is the corner
coating of the eye magnfed The pupil Of the eye must
now be expanded, when examines closely very
minute object when the atomic world Of globues that
compose the crystalline fluid viii be dscerned behind the
surface of the and the steader gazes
the clearer this wonderful and beautiful spectacle
perceived in all its surprising variety Of FORM beauty
and motion.
better medium than the card proposed by NJ Andraud
have used in making this experiment. It is o small
lens 1.-THE eyepiece of broken spy glass; with inch
and half focus This held solar lamp or candle,
at six feet distance turned towards the full MOON
(which is better still the chamber Of the eye is far
intensely lumined than by of the perforated card
The lens Of ordinary magnifyng spectacles win
equally as well as the eyepiece named by covering the
surface with opaque paper having in the centre clear
space to transmit the light throughout into the pupil Of
the eye.
Trusting that this experiment for seeing the elementary
molecules Of the crystalline lens viii afford to others the
pleasure which and many friends have derived from it.
and trusting to the indulgence of NJ Andraud for reject
ing his theory Of aerial atoms, remain, very truly,
yours, l.
ST.. JoHss PARsosAGE,
ABERDEEN MISSISSIPPI, JUNE I, 1852.