New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1878-12-14
SCIENCE FOR THE PEOPLE.

NOLCAS OES II TIE MOON.-IhG elder liersChel
fuIy believed that occasion he saw the flames Of
IN active volcano In the noon and quite recently Dr
Klein announced his discovery OF crater on the
lunar surface sin the prevail ing impression among
astronomers Is that the "A dead world, and that
evidences - past volcanic action III that sael-
lite are abundant IT'S Internal fires long been
eNtiug shed. The rOyersy 10 tIe existence OF
active volcanoes kely however, u be renewed by the
publication IN The Scientific American OF supposed
eruption ~ lunar volcano by Mr.. John Hammes
aud MS O-kaloOra. Iowa. the l2h OF Last No
ycmbcr, At $50 p M Mr.. Hammcs, II appears, has
Gig inch telescope, with which he travels around the
country showing the moon and planets to schools aud
eyes. is therefore, familiar with the appearance
At that BODY aud the Of his instrument He describes
the eruption lasting half an hour and as being OF the
color and plainly visible any other mountain
srcncry In the Ts also the phenomenon,
but Describes the crupye strcak' less fan-shaped
by hts father. According to tue sketch
furnished by IIammes the new volcano seems 10 be
In Of Baco, Barocus and Ncoai. rs given on
Beer auI Midlc.'s map of the moon Mr. Hammcs nGd,
Of course 40 means measuring the height Of the erup
don, hui hi, sketch shows that It proceeded rom
ccarl defined crater. Mr.. Humm,s Is wei known IN
krukuk Iowa, aud the Md'or, Postmaster ana Othcr
ui. al, %. that cty vuucn iur hln an honest and
trustworthy IN. Tue surface OF tn moon - now 20
cio-ey scanned boih mere ana III Europe thIt ~ thc
cru ltlon ny Mr. II tum's was not optical illusion
and many remarkable instdncr- or such mythical APP
pctr"hc"s are on record II ouEht 70 DC cohnihtd oN
utnef Oh, Meantime the belief that The moon is
scientific men, aud tn discovery OF this supposed
volcano Is sure to str, ugthrnit.
Is IT. New ELK f-COlOnel =. w. Norris,
Kc,p.roi he Yellowstone National Park recently
lhlcd ~ Detroit before the sccnh' Society various
uatutu specimens and curio,tes gathered during sew
eral months Of exploration In the wIlds Of Montana.
Among item the head and antlers Of huge ANIMAL
Thought to be a between the elk aud the moose
The anters are weDDed and Professor Holmes. OF De
tia i'm
years experience, anything resembling this
creature, ana The Crow Indians Of the Yellowstone
region OF nothing OF the Kind before Lord Stanley
said DESTROYS Of procuring the specimen for the
Brush Museum but Colonel Norris lnterpOscd his
authority Keeper Of the Ma ona Park To prevent -
ucng taken ont 81 The coun'r' ana ncha7"d o. the
hunter or 500 The animal IN hie was Of gigantic
Size and It's hcnd and antlers are suggestive OF immense
strength.
THEORY OF THE TIDES In his admirable
work on Popular Astronomy, Prof, saor sm0n NcwcomD
gave a somewhat novel answer TO the question why
there are tides a day. Representing IN a diagram
AZ the OF the earth. NJ the mo0n g, the cenr"
of gravity Of the two bodies "a point within the earth
about three iourihs the earths radius from the
tire toward moonJ. c. the point OF the earth's
face directly under tho moon and ID, tlc corresponding
roIu on the other side the earth, the Professor cx
planned that tidal would be caused at ny the
attraction of tho aud the small centrifugal force
around g, and that at ID, where the centrifugal force
would be thrown and form another tdal-wave, the
whole action thus making two tides to each apparent
daily revolution Of the earth. This explanation was
questioned by Mr. Arnold in lecture published in The
BOSTON Science Observer for October last. Mr.. Arnold
claimed that this motion OF the earth around the COM
mon centre OF gravity OF the earth and m0On, WHILE true
a oae u translation simply, aud not motion II rotation
~ yould Ice IN erred ffnm Professor Scwcumbs xpana
ton tunt the centrifugal force Is not greatest at the
point and least NJ c. and thar, therefore, II cannot
.roducr the dc the sde opposite 10 tue Pro
lessor NewCOUb very handsomely acknowledges hls
.rrur. " see" he saws In the November number OF
Tie Sc,ence Obscrrer, that Mr. AruOlds structures
well TAKEN and that the modification he proposes Is. In
principle least entirely sound The and rig
translation OF the si0ns for tins force from
does not seem possible but | supposed
enough right 10 give correct general idea Of the
why are two tides daG. now see that task
H. "a difficult ore than supposed, and one which
requires good deal of close attention fIom the reader"
70 question whether the common explanation of the
tides gwen IN the textbooks should he abandoned, Mr.
Arnold replies " 40, necessarily" They LOOK at the
subject from point 81 view rent from that taken
by Professor NcwcOmb and others but reach the same
result by valid chain of reasoning.
TIE HABITS OF BIRDs.-At a recent meeting
of the Maryland Academy of Sciences Mr. o:to Luggor
read paper ON birds based upon his personal OBJ
servatlons Most birds no said, take but two II
day-eary In the morning aud about dark biz DIS OF prey
raj ely than one day. Three hours Of tho
twenty four sufficient rest IN sleep FOR singing
birds. They sensbly affected by atmospheric con-
dions, singing less, and less Jubanuy during cloudy
wet weather Male birds usually maze with one female
aud faithful TO her. guarding her while she builds
the for tho coming brood and feeding her while
is ncuDaiug the eggs. taking her place while she
flies OF in search OF food Birds have little dscrmina-
ZION what kinds of eggs placed under them
nest TO ncubate. and viii try hatch
placed In the nest instead OF eggs. temperature
$50 Fahrenheit for twontyone days required 10 hatch
most birds eggs The young not assisted by their
parents leave the egg but when each has broken
It's way the parent carefully the pieces Of
broken egg from the The young generally emerge
ffom larger end OF the egg before coming out