New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1872-12-30

The first question which We have to answer expert
anentally tonight is this; Is the eye organ Of
vision commensurate with entire range OF solar
adiauoni Is capable Of receiving visual impressions
srom al the rays emitted by the stunt The to
Ghis question We fud be mo" On both Of the
spectrum thereis cupious outflow Of rays which in
competent to excite vision Beyond the violet end Of
The spectrum this vast eux of rayt entirely useless as
Regards present OF VISION eOpious and
ared able TO form invisible spectrum five or
six times long visible II the theory "
Evolution be then there in store Tor visual
inspections far grander than he has yet experienced
These eyes of the future should ind beyond the violet
ahe actnic rays which produce chemical effects, rays
which produce the decomposition Of Carbonic acid in
plants and which have great power in all the pro
lcesses Of vegetable and animal life.
An image OF the spectrum was then cast upon the
screen. and the position Of these invisible beyond
kbe violet pointed Out.l
These ultraviolet rays waves though incompetent
No STIR the optic nerve von able to agitate the
knoleeues Of certain substances to shake them
asunder and produce chemical decomposition All pho
Geography IS founded upon such chemical actions; but
there special Substances which these ultraviolet
eays exert special power They darken the white salts
bi silver and by permitting spectrum to fall on paper
properly saturated with solution Of such SALTS the
chemical action reveals the existence and the extent Of
hhe ultraviolet spectrum One Of the earliest not the
VERY earliest attempts OF this character made by the
celebrated Thomas Young. who photographed in this
Se rays obeyed the principle Of interference exactly
stke the visible ones.
RENDERING ACTrNIc RAYS VISIBLE.
AS generarule bodies either allow the passage Of
Eight they generate it. TO technical terms they
transmit the light they absorb It, reducing 1t to dark
mess This absorption, however, is not humiliation OF
The light it Is in fact Of it into heat But
there which the Lights neither absorbed
nor reduced to darkness but transformed into Light
of another kind. Now Prof Stokes who has long occi
pied the chair Newton in the University Of Cambridge
knd who of original workers. who. though
not widely knownbeyOnd scientific creIfs, really CON-
btute the Of science, Prof Stokes say has de-
nopstrated this change Of one kndO hight into another
Ind has pushed his experiments far rs to render the
Invisible rays visible. piece Of paper mostened with
huphate Qunine when introduced into the portion OF
kha spectrum beyond the violet renders the nonlumi
nous rays which lie there luminous BY the use OF violet
glass in cutting on the great of tho luminous rays,
ke obtain a light rich in these Invisible rays and TINS
Night NAV thrown upon the and the presence OIL
nuch rays demonstrated BY the paper covered Win
Rnlphate Of quinine.
Z tThese experiments were then performed. The light
obtained from the electric lamp constantly used By
dhe lecturer was passed through prism Of glass, and
Image OF the spectrum formed lhe The Pro-
kessar then introduced sheet OF paper mOisened with
auIphate IT quinine into the spectrum beyond the
Violet Immediately a blush tint appeared where pre-
N1ously none had been The light from the electric
lamp was then suffered through sheet Of violet
eolored glass and the experiment was repeated with
HE spectrum thus obtained. BY the use OF another
eheet Of paper prepared by Prof Morton OF HObOken.
beautiful green hue produced. sheet Of paper
properly prepared. which with leaves appeared
In outline was placed IN this Light, land Immediately the
rose assumed delicate blue tint while the leaves showed
IN exquisite emerald green. The complete success Of
khese experiments swls well appreciated by the audi
i4nce
These effects are due TO theIOuaty possessed by the
auphate OF auinne by other bodies, Of changing the
Eapid vibrations OF the rays beyond the violet into
hlower vibrations, and thus rendering the nonuInnous
kzys luminous also chan gng one kind Of Light into
Another FluOrescence is the name given 70 these Of
fects The human eye beautiful Instance OF this
uorescence as Dr. Bence Jones has shown. aud there s
NO Doubt some substance the crystalline lens anao-
fous to the sulphate ofiquinine in It's action.
RENDERING HEAT RAYS VISIBLE.
The next question before this EVENINGS, is radiation
seapabie Of dfusing heat TIE same apparatus with
srbeb the diffusion OF Hght has been shown will also
acre 10 show the diffusion Of radiant heat first cause
IN image OF the carbon points 10 fall the BY
Lravfng out the lens, the image contracts but its in
k.nsty increases. II place some paper In the
locus Of the image formed the paper VIII smoke.