Year: 1875

Placing this thermopl In tho center or blaokest part
OF spot where the light Is about per cent tor


s of that OF the rest found that the heat was over
80 per cont Accordingly IL seems that tho spots radi
ate times heat than light. and 1t follows from
other observations that the whole solar acts
in this curious way, but In less degree apsorOlng
always the called chemical rays moro than the umi
nous rays and the luminous more than the cal0rinc


CONSEQUENCES TO EARTH OF CHANGES IN TIE SUN


Were the solar atmosphere removed It Is probable
that own atmosphere, becoming moro surcharged
with aqueous vapor under the intsnser heat, would
shield perfectly from the heat rays and enable
still to exist earth. But It follows from what
has just been sad that would be an earth OF slngu,
larry changed external conditions, with an af1ux OF
intense light and with still greater proportional gain
In the aonc rsdatiops II tho theory that the latter
specially affect the growth OF plants be cor
rect tnen with thinner solar atmosphere
the lu1ur,an vegetation Of tho present
and while our climate remained nearly the same the
northern United States might not improoably be GOV.
cred with the vegetation of the tropical but
In the strange cOmpanionship OF ice aud snow rms,
however is view TO which little weight attaches; and
what important for us TO notice is that we can
why this solar atmosphere-not Ike our
poured into
alter It's volume; while with any increase or diminu
radiation. S but quite different kind Of radiation
from that which tho Sun now sends US. Has
Of our earthi Has the thickness of the solar atmos-
phere-the character OF the sums radiant energy
altered so produce those wonderful changesi Ge.
oiogy tells Of when the palm grew IN Iceland and the
elephant fur-protected. wandered among Siberian
SHOWS. "When" in HelmbOltz's words " the amb r
tree boomcd and dropped its costly gum upon the earna
and sea; when in Europe and North America groves of
tropical plants fourshed In which gigantic lizards aud
them elephants whose mighty remains are stll
buried In the EARTH found home" .


Hope shall not be led by the interest take In tho
subject OF these researches to exaggerate the import
of the total and seectye absorption OF the solar
atmosphere whom that IL appears to me that some
of the mghtest problems In our study OF the history
OF this globes preparation for man. and OF the future OF
The human Itself, may be bound up in 1t. What Is
this vail which hangs before the face Of the SUM- Ac
cordng as IL became thinner or thicker tonight, the
sun would rise tomorrow no longer white, but In Que
case of blush and IN the other OF reddish hue and
did this apparently Insignificant change continue.
few days might see the end OF man and his work.


We have that we have every security that the
heat OF the sun will continue within ITS envelope, foI
untold time; bat what security Is there that this heat
will be allowed to reacs usf Wnat Is this vail Is IL
solid and permanent thiugi Far from 1t. IL Is some
thing on tie WHOLE probably lighter and more unstable
than tho wind which Is whrllng the dust On a street
Have we the that II car never be Increased
or diminished Far Otherwise; 1t Is receiving at every
Instant aeces.ions from thousands OF Volcanic bursts
fro the suns interior. You see on the screen
section of c wb Qf the sup rs 1t appears through tnt
slit OF the specuJsoopa. and 6ae OF these erup'ions III