, 1875-07-17

aroaAas THHtn EATUHE, CLAsaIr7cATIoN, AND
IAra. WlrI TIE MKANs or rhEntu1INH THEN 1T
N1s1N- Formerly irnfesaof II tho Natural setsMey.
tn the IYctltn at Matluter. 12Mo.. TT. vi lhll4-
delphla: Porter Il Eoates.
Whllo Prof. D'abins was engaged In scientific
studies with Prof. Agasniz At Cambridge, nearly
twenty-five years ASo. violent aud destructive
tor1,udo occurred at West Cambridge. Having
Witnessed somo portion OF tho nheuoncna dis
playcd bY this storm In itH enrly career, tho In.
torest Of Prof. DlasiuH was strongly excited, mud
ho entored upon an Investigation OF ite effects In
order to determine il possible the unture and
catse of It's destructive forco. Five weeks woro
spcnt by him in . minute survey OF tho entlre
track OF tho tornado, tho result OF which
waa conviction that both tho popular rival
theories as to the law that governs storms-tho
gotasy theory OF lscdtled and tile inblowug
theory Of Erpy-were erroneous. Following the
1ao1c OF investigation prescribed BY Mr. Nalde1d.
Which Includes only certain gcctions Of tho Bceno
Of tornado Prof. Blasins found 1t easy 10 adopt
his theory, but, on atudytnG tho ontlro COURSE OF
the storm from beginning to end, phenomena wcre
revealed that could nok DO explained by the
rotary hypothesis. And no With tho lnbl0wlug
theory Of EspY. II could be reconelod With PAT
ha! or disconnected observations, but not with
the uhuie uaass of data gathered by conarlete
survey OF tie ground trayo1scd by the storm.
Continuing his study Of atoruis for a period
Of three yeass. Prof. Hlastua gradually built
u, Il. now theory, which 10 claims will
satisfactorily Rcconnt for tho origin. chaTactes,
progress. and sprcarauce; not only Of tornadoeH,
but Of ail stosn!s occurring throughout tho di1or
ent SEASONS in the Temperate Xono, and par
ticutariy III the United states.
Contrary to tue generally received opinion OF
H~r,$ hell
eject aud not tho cause ot opposing aerial cur
zantH Of different temperatures. According to
bis demonstration, local aud progressive OF ro-
saly storms aro ecnefatoa by conflict between
THO cue blowing cool from tla nos,h and tho
othef warm troaI the south. 1T tho critical
moment III tue pFogress OF tho storm, when &he
tchs!on bctNcen tllo two currents has produced
N ctlo.liotaaln. should some disturbance OCCUR
(a8 from peculiar cuulguratlou Vi
tho ground over which tho storm-cloud
il passfns) ~ tic place OF meeting
or .he two balancing currents. causing ,tt; o,s t.
FAsh suddenly forward CT 10 sink 1T . GER
tain po'nt. the Other ~ suddenly pu1sues d
paufa t<es IT, a1,t atitsi IL produced, Nbieh
travels in tha diagonal Of the forces of lie twu
safssnts ~. thsoush tha region q calm between
underneath "hlcla 1t Will t1aYol.
Ths centrifugal force &nd the xarat eyotut1n,, r.,
t1t.ut hest fruu rnndensatlon will aoon crsats sn.c.
jprreasSs sgai tls rushing up uf IT. Irua lowrr ~
pioua Of thS equatorial cusEess, thus adding uuw con
lcusAtuuA fr1u4 below. aud au further Isngthtnint
thu rolasina eioua downward. Afser
evolved by ,nn rouasa.as,on ~oali snc,sss, sI
thy ,eairt 1atuse of tie r''ud On tAa aa.sids, IL
rarrt.ctpu tho insIlo rsaIn,et " tho centrifugal
fosca would cause ibis AEt ci lilo vufte1 be 1uu.
culder That tLa cloud Assun'es tho slats II II
inslsle cons follows from tho action Il tho ceatsfugx
force gu The spsfuy srndIux rI0aa. Fur the lon9c
the paEts Of tus cloud rotat. taulr NAY upward
the further they viii le tLrow4 f1ou lhs sAts. Thu
tAe akape u the tufuauu-ylonu futAlG1 sul
tenglhsas gradually uwn the surtaca Il the s4tt
When thu toruado-elold las approached tue grl'nt
tLs surrounding slf on the surface will rusL Lilo Ii
t14ss II s2s~as4 aiE Ut ths xoEtsx with 4 xSl,c.
rrupaztlanAts " ths dtasEaes Ut psessuss- sutdd