The Red Cloud chief., 1878-11-07
THE WORLD W SCIENCE.
Sprsais es che Nersh~ra q. per.
ate o'sOra.

before the Harvard University Natural
History Society. Published IN nc dmor.
dean Journal Of Science. claims tina, our
present forA comes from high and M,
low lsti,udc-. The true explanation ~
the whole problem ~ the distribution
of plants Is 20 bc found by looking To
che North to the Arctic Zone. North
of our forcs, regions" he says. comes
the Konc unwoodcd from cold. III, zone
of Arctic vegetation. In this. ns n rule.
the species are the same round the
world; ~ exceptions. sone arr restrict
ed to q part ~ The circle, Tho polar
projection ~ the earth down Ia the
northern tropic. shows Ia III, eye as
our maps do not how NIL the lands
come together Into n region, aud how
natural !, may be for th. same species
under homogeneous conditions. Ia
spread YER H. When We know. more.
over. tina, sen nad land have varied
greatly since these species existed. we
may well believe thai any ocean gaps.
~ IN ib. way ~ oquablc distribution.
may have been bridgcd over There Ia
nov only onc considerable gap. What
would happen u n cold period were Ia
come on from the North. aud were very
slowly Ia carry IA, present, Arctic elf.
mate. or something Tx, ID. down far
into the Temperate IoncP Why. lust
what has happened In tho glacial peri.
od. when the refrigeration somcbow
pushed all these plants before Il down
Ia Southern Europe. Ia Middle Asia. Ia
the middle and southern part ~ ,h,
yF-l.-l CT. - ell. -
Jeff some parts Of them stranded ON ,E,
Pyr.nccs, the Alps. the Ap,nnincs, the
Caucasus, on our white aud Rocky
Mountains, or. wherever ,hcy could
csc ape the increasing warmth ns we'll
by ascending mountains AZ by recrdinp
northwsrd al lower levels. Thos, thai
Kent together AT "A low level. and mad,
good their retreat. form The main body
OF prcscn, Arctic vegetation. Tho.,
that took ,o tho mountains had their
line of retreat cut oil. and hold their
pu-itiona on The mo%un,nin.tops under
cover ~ y trig'd climate u to clo-
sa''on' my c","'"o"."i 'hcs" on IN
!c,cn' o"n''non's UT "in'r'n, noun
,a,ns are s,nn'.ar, ou' no. who'iy a',kc,
oo"c "p'o,os pIovru pct.er auap'cd u
on'. r"no !" announcer Pat' "' 'nc world
wnoIo "ss nnP"" or less nuap'ab'c'
'n'y 'Per'.heui wn.t' better nuap'.
c", '".y co"''h"., WIN or without
SUM '"""go 'nu no"'" w" u'''fs,h'
eHuon y, aP'"s p,ah's, AZ wen rs we
go"v.s' nN,"'ss '".""Hn MI u North'
~" ne",sPnero, AZ ms cNacuy APP
pnss '","o ,'"P.rn.' zone vegetation.
anu w .mo 're's .nW we NJ. ~'"n'frnch
WIN; u WV was s''hoo wh"h inc
FOSSIL "o,shy ~ 'ne h,,gh Arctic regions
.a"r Y" ngn'' whch " vas dcn,ons'ra'
W" ,"s''" '"' u'"h's ""Nt prosecuting u
g'Ao'a, P'''"u IN the ia'.s' tertiary
run SP,'n"ergon IN Iceland I" Urcnn'
.."" M" Ns'"tsona'N"' u ','ma'. IN"
'ns' ". +" ''Jos ~.''n,ieu ara Tor.
.s" IKE '""so W hnglan u
srg'n,a anu ~ california. clothed the
sAn"- W" 'n,"r 'he on'na'c from the
..ec"' nnu ,nc 'rees give "ro 'no'ca'
IONS" '"' '''"ha'o'
Mod~ra ssccam deposits.
In his rcccn, address bciur, m, Goo.
graphical section of IN, british s,icnc,
AsscsSat,oa. SIR W,yilI, Thom,.,n wi,
head ! IN. sciontiu, marty an ,h, vhaI-
l,ny-r trim. pcin,,d ont ,om, c,rions
features al the acpo,i, nov ,orminy a,
grcn, d,pth In III, ocean o,., III,
whole area of IN, Pacific. for in.,,,cc
and especially In It's deem waters ,hr
dr~iyr brings M a line red cla,. In
magnet bc drawn ,hrouyb , n%n.,,i,~w
al this fine clay well Utilised in water
II will be found To have caugh, am is
surface some minu,, mapn.,Ic snh.rn.
les. some apparently Of mrtalli, irrn In
a passive state, and some az ma, lilo
nickel. From the appearance az these
particles, and from tho circumstance.
that such magnetic dus, has been al.
ready detected In the sediment of snow.
water. some arr of opinion tina, th,y ARA
al cosmic origin in fact, r,,,s.ivslv
minute mcteorics. Summiny nm wha,
Is knowa ~ the bed az the ocean. Mr.
Thompson saws,
$50 far AS ", can JUDGE, After n mos,
careful comparative e~xamin.,i,n m.
deposit which is a, pres,nt h,,ny ,,r,,,