, 1874-03-11

lllG tklECAGD a}1at
though having, at starting, all tho velocity witt,
Which 1t had arrivol; but IN lcHA tnu fu,lr days
that wondrous tail, 0n000,0oo miloB long, was
| thrown ont III front Of tic body.
| EVIDENCES OF THE REfu1.H1ON THEORY.
| will now tlonl with QUO or tllUAe Hnlall COM
oth worry curluua, illtlood, Ia tllolr history. Wo
l,avo hero all tho ovldunco wo ea1i got, although
1t III mot worry striking. In tlo ycar 1770
which llnylng bonn wntolod for timo, was :oun,l
| npt to bo travelling tit ono OF those long OWL
reths. such es arc bore preaontod; but in path
rioda, was completed within n roriod of 1iyo and
q l,af years. 1t wn8 Called from tho ilame of
LExErL's COMET.
| It wan never aeon again. Astronomers thon voro
lotl to inquire what had booomo Of tl,is comet.
Tracing 1t bncf. they found it wua In a patll 10
| near to Jupiter that tho giant power OF TINT
plunot arrested It III ta co.irgo, aud scnt 1t out
on mtll entirely different from wllat it Yau bo-
fore. It waa ,,aooss to lopk for 1t. This quoa-
tion ll,on arose: How was 1t TINT tais oomot OF
| worry striking appearance had mover beon soon
| boforo2 Travelling in period Of nvo and n l,nf
yearH, how vas II It llovor had boon soon? They
tracea 1t back and calculated its pntl, and found
that tho BANJO giant l,aud which uent TINT comet
away Ind introduced 1t. Tllat comet, In 1867,
approachod quito clona to Jupiter 30 cloao, III
Jupiter compelled 1t to follow another course.
At tho end OF oloyen years, tho comet having
nntlo two revolutions a,,ll Jupiter ono, 1t was
again aezod by Jupiter, md sol,t outsdo Of tho
| aolar Bystom md wlloro 1t haa gono nobody
Knows But still tlloro is ono point about this
comot Of Loxol1 worth notice. It Ind gono into tho
midst Of Jnpitor'B satellites. Tile satellites nro
not largo objects, and 1t tho comet iad any mass
lio could disturb them; but inHtead Of tint all
led before that comet Ind arrived, md wo 1oari,
| therefore, that that comet ut nny ratio WAS more
| varor, had no power and 10 weight, although 1t
wnB much larger oycn than Jupiter. 1t l.ad no
powor, no weight or nttractiyo Influence to dis
turb those little satellites which Jupiter manages
| 10 onsily.
COMET OF 1913.
| Now no como to nnottor conlos-tflat seon In
| 18l8-trayelng OIL tho eiostest period Of My
comet ne know Of, a period Of tllroo years and
| four months. It is noteworthy on this account,
that this lttlo comet sco'ns to bo gottlng cloaor
| md closer to tho Blln, travelling always on
tardetl by tho influence Of Homo mattor occupy
ing space. Tt may Heom a strango faot to eay
tint It is retarded, and yet it Is travelling moro
nnd moro quickly. But that iB the effect Of ro-
| tRrdntion III my iu8tnnco.
This comet ii travelling faster and fastor on q
and 60 to ono, tic facts rcyou'cd by whio1, aree
among tho most cu3i,onsml s;oa mean tho comet
watched, and thon it was found that thiH
comet Ind boen soen boforo by Carollno
norscho aud otl.ors, and a. path WAS as-
slgnot to 1t, having, period Of siS years
first place remarkable, bocauso its path crossed
tho cartl's path; and, 1tnleod, on tho noxt re-
turn, in 1832, Rstrononoln announced tllt that
comet would actually croHs tho onrtlis path, and
many thought TINT TINT meant that there would
bo collision, md great alarm waB exritod. But
t tint passed away, and nothing moro WAS heard
until 1SiG, and then tho con,ot waa found tray
cling OIL it's uHaal patl, and, to tho great aaton-
tahuont Of astrononerH, it wns announced that
tho comet hnd divided into two parts. oach hny-
ing distinct load and nuclona. It waa noticed
by Capt. MAury Mt the Observatory at Washing
| ington; but strangely enongll,son tho night
when ho observed the comet had doubled, tho
records Of tho German Observatory showed tho
comet to bo single, mud it would appear, there
fore, that tho grcnter clenrncHs OF tho atnios-
llliero III America hau onablod him to recognize
tho chan;o before it was noticed in Europe.
Two separate comets travelled Along eido by
side, aud tho strange circumstance waB noted
TINT tloy intorclangel light !; sometimes QUO
md sometimes tho othor was brighter, MI if
there wero communication between tllom. They
were D kind OF Sian,oso twins. They passed into
Bruco md Astronomers thought thoy could
watch tho couats again nnd ascertain how they
wore separated. but tho comet WAS nova:~soen
asain. The year 1866 can!o around, AMI astroi-
looked for 1t. Taoy examined tho pnth over tho
hoayonB great distance oil either Hido, but they
failed to recognize that comet. l told you tint
comet passed tho path Of tho onrtll and tlloro
nre other Bystema which nlHo croHB tho pat1, of
tho onrth. 1t WIS suggested that tho comet hnd
encountered moteor BystonlB aud split up, a1ld
was ayaln mud again split up, aud so vanished.
You will Beo thcre "ns an important connection
between that mud what wo llaye learned since
about tho comets history. Tho year 1879 came,
and that comet wns ngain looked for. Other
calculations wero made III to itB path. It was
looked for moro carefully, but iii 1872 it WIS mt
seen. loaye its history ior tho tinlo, presently
to return to 1t.
WHY SOME TAILS ARE STRAIGHT AND OTHERS
Tliore was comet seen i'll 1858, and called
DunatiB comet. Let IT'S, in tho first
place. deal with TINT comet. Why should
the tall Of comet be curved? Tho
position Of a. comets tail ia duo to rcp,llsvo ac-
ton, atd, If that repulsiye acto, take place n-
modiatoy, 1t ia quito clear tho tail will bo swept
into straight line; anl if you 1ooi at straight
line, no nniter how placed, it would look straight.
moderate rnto, tho tail would appear curved.
You cnn understand that curved tail bollind u
comet is due to ropulsion not tnking plnco
itlstantaueoualy. The hcnd Of tho comet con-
sists Of two kinds Of mattor-ono WIS rorollcd
with moderate velocity worry great hut moderate
by compariBon--atltl tho other rcpclled with
great velocity, md 30 swept of iuto n straight
limo. It would he manifest, that being tho cauo,
Hnco tAoro was separations or tho mAttor i'll tho
comets tail, that il tho comets head wns COM
plicated in structure, there would bo m inter-
mixture Of tho two kitlH OF matter, md tho por-
ton OF Tho mnttor moro readily repoca would
escape, carried oil by tho other ta, carried into
tic curved tail. md ut Inst would lo swept tnway;
and perhaps little later nnnthor portion would
be swopt AWAY, md 70 You would Aco extending
from tho curved tail various Btroalsa OF t,ls NUT
tor.
CONNECTION or srETEons WITH COMETS.
pace from these facts, wonderful III they aro.
aud introduce tho subject Of nsoteprs. For Il
mr. nRtHnfH nj