The Sun.
London, England, 1865-01-23 00:00:00

ROYAL INSTITUTION.

ir
The evening meetings of the members of the Dlai to
stitution commenced for the season on Friday. The lec„
was delivered by Dr. Tyndall, the subject behig ea
Combustion by Invisible Rays," and the chair was oceqd
by the Comte de Berri. Professor Tyndall cowmen
explaining briefly the discoveries of Sir Wm. llersehe' be,
M. m ellorie on the heating property of the invisible raSsfio,
yond the red in the solar spectrum, and by noticing he 1,1,
ther discoveries on the same subject by Sir John Iler'a•oegi
Prof. Stokes, and others. It had been ascertained by s"01
experiments that when a beam of light is deeellthe
by refraction through a glass prism, the healing Ix'wei%riys
various coloured rays is different—the violet and WI:: vl•
giving less heat than the green, the green less than tjue
low, and the latter less heat than the orange and re'
jot
only so, but beyond the extreme visible red ray 01°,0
was found to be much greater than in any of the light-Pto
rays. The proportions of heat in each part of the leccopt
when a glass prism was employed had been determinefor
as glass stops a great part of the heating rays wheu ;0
mitted through it, the experiments with such a P 011.5
not indicate the actual quantity of heat. In Dr. if,3.-11 per'
experiments he employed a prism of rock salt, f best
mite the rays of heat to pass freely, and the source %or
with which he experimented was that excited by the ltpe-
descent carbon points of the electric light. In hIS
meths'
ments, also, he adopted the plan of employing dar'rroittei
which obstructed all the rays of light, and Yet Pe 4005
the rays of heat to pass. In his previous exPe,
on radiant heat ho had ascertained that °let- d
bodies, whether transparent or opaque, ;freely t`' ;Pr
the rays of • heat, and that compound bodie:lo Delk
ever transparent, obstruct the passage Of t„,,,,0
ing rays. Applying that discovery to his re"c,.- 5111 r,
into the heating power of invisible rays, he obtaine"i
stance that was perfectly impervious to the ralsw°,, ottlr
yet freely permitted the heating rays to pasS• so
stance which he found best adapted to the PurP°: ffid,
iodine dissolved in bi-sulphide of carbon. Bienniasll4'
though it will not transmit any of the rays of the wcoo:
light, nevertheless freely, transmits the heat of ele :00
descent carbon points, and by that means he alcA3'.
that the heat of the luminous rays bears a very 111°1!
portion indeed to the heat of the invisible Vl' re°se9'
spectrum. This was exemplified by a diagram 1.e.„1%
ing the relative proportions of heating rays in t':o
nous and in the non-luminous parts of the SPCC jieo
the electric light. He then proceeded to show tll6,,,eti'
ing power of the invisible rays by a number ef.:3;ji?
ments, in which the luminous rays from the elect';:eolo
were entirely cut off by passing through the blao' ,411
tion of iodine, and various combustible substance 6
ignited by placing them in the focus of non-lumia°llsel
In this manner paper and wood were set on foe,fl
were ignited, and carbon contained in a jar of ogg.ae
derneath, thP
brilliant combustion. Dr. Tyndall, address
Comte de Berri, asked if his royal highness ereelreL f 00,5
so, would he oblige him by lighting his cigar in
of invisible rays. The Comte de Berri came forty
P idto
readily, and lighted a cigar in the spot indicatal,te ti/Ddd
amusement of the company, and Dr. Tyndall ob,soc'it,
his royal highness was the first member of any Or'
who had ever lighted his cigar in the focus of non,luiibte
rays, though Frederick the Great of Prussia ha'l
spirits from the point of his sword by an electric g)3l:tAl/
concluding experiment consisted in rendering P tV,
foil incandescent by holding it in the same fc'cilt;sol/'
experiment being the more important from the fact 'toe°,
light produced was not by combustion, as in other 1115•0°'
but by the conversion of the dark heating rays int°lll;;til*
ones. Thus, light, after having been separated into
and non-luminous rays may be reconverted iat°o.
light, which undergoes refraction, and may be e'„.
into the various colours of the solar spectrum on beied,
mitted through a glass prism. Dr. Tyndall °ll:ff rf°
conclusion, to the possibility of the existence in dwbevA
parts of space of invisible foci of heating rays wili,oe'rif
render solid bodies traversing through them tenhto
brilliantly luminous, like meteors. The lecture Ole'
completely filled in every part.
COUNTRY MARKETS

GRANTHAM.—SATURDAY. , 4()Wipr
Old white wheat, 42s to 445; old red, 38s to T., „Yet
white, 42s to 45s ; new red, 37s to 39s per 36 sr...lei-0°30;0
ley for malting, 30s to 34s per qr. ; grinding, 2'540 ppe,
30 stone. Oats, old, 25s to 27s ; new, 22$ 2as oto
stone. Beans, old, 418 to 435; new, 36s to 38s Per
Peas, 348 to 368 per 36 stone.
LEICES TER--SATuR.DAT. 428 ;1r o
Old white wheat, 418 to 45s ; old red, 38,5 7.„De•
white, 40s to 44s ; new red, 36s to 408 per 30 6.".500
ley, malting, 328 to 34s per qr.; grinding, 28s t°
24
stone. Oats, old, 28s to 30s; new,-24s to 38e,Pf,'„,.
Beans, old, 41s to 42s ; new, 36s to 38s per 38 sw-L'
ifil!
YORK—SATURDAY. „Oil(' 1"
The weather is. now fine and seasonable, „lip., to
cause an improvement in the condition of the goe 0,1
our market to-day there was an averag e attend/41,0 A
trade, and :a fair show of wheat, for which there iv-
SA/sale at nearly la week's prices.
-
New white wheat, 40s to 45s ; new red, 365 ° S
e
36 stone. Barley, for malting, 28s to 308 per qr
' to
26s to 27s per 30 stone. Oats, now, 208 to 22. s Pe
Beans, 40s to —s per 38 stone.

NOT TINGHAIik—SATuRDAY. vbest
At this corn exchange to-day the show of
the growers was pretty tolerable, there being 3' 004
ling of white and red sorts. to 415; 9
Old white wheat, 43s to 46s ; old red, 328„t0ne.,,007,
white, 41s to 45s ; now red, 37s to 41s per ou. "303; `3os,
ley, new malting, 28s to 34s per qr ; old grit' 25e t° (001
27s ; new, 25s to 27s per 30 stone. Oats, old, e
naw, 22s to 25s ; old foreign, 24s to 26s per stoll
old, 40s to 43s ; new, 37s to 39s per 38 stone.

NORWICH—SATtatnAY. 5;;;,g
t° filii
White wheat (weighing 631 b to 641 b), 44 gto
ditto (weighing 631 b to 641 b), 36s to 38$ ; „135
barley (weighing 551 b to 561 b), 30s to 33s ;
(weighing 541 b to 551 b), 28s to 30s ; distilling ditto to
mg 521 b to 531 b), 84s to 28s ; oats, 24s to 26s • be„dlu
to 395; peas (maple), 36s to 38s per qr ; flour,' 2°, 4'
6d. Average—wheat, 2,000 qrs, 33s 4d; barley, 9,4'
29s 2d ; oats, 32 qrs, 26s id.