, 1879-05-10

tempcrature becomes raised very much abovc
!ts normal condition; ont, g., e. soo1 y. =.
ar ar * ts N''e'; ee'1, radiation of III:
surplus heat commences, and tho eartl,
during the night continues to send Its heat Into
space, until the sun rises In tho morning 10 give
Now, In tlils cooling down Of Terrestrial things,
board p1ankt the grass. Or Other substance, IN
or near tl,c grounl be:oincs no cold Tint IT con-
denscs the moisture IN The air.-this Watcty
yannr to which have especially drcetel tho at-
tcntl0n Of TIC fcAder.--ad IL Is prcc!pItascd on
tu nny cold substance tho temperature III wh!ci,
Is lower than that OF the surronndin. air; nlH!
what We call dew. II tho t,oard, grass, or other
substance has been reduced to a tc,nreratnt,e9
below tile trreznE-po!nt this dew vii
nt uncn CONCEAL md bccotncs irost., We
tes t, P1nSno , ne1 ' sh. sa,crn 70
yapor by cpmiug IN contact With The cold glass
IN our windows. Tie glass Is cooled by tie cold,
dry mir outside: md the wurH, sapnry air in
Into watcr, wh'rt, is only an aggregation If this
vapor III tlIe air; unl II the glass Is cold enough,
It bcconcs froai. The principle ID preclaeiy The
sainc In one rasc az fn the o:ller.
first Or chiefly discovered and demonstrated by
Ur. Wells, nf I.tndun, in 1915 Ile found, by
laying thermometer Of, tl,e ground or Erass III
4 clear night, With another suspended four to
esA aEGI HuOfo lHE Sh!tht tlhA$ Iftn nSth AV'aI
down OF the sun at night at.Gl sunrIae ttie
next morning, the temperaturc as inul.
Gated ny uIe thc'Inometcr on Tue Esouou
was ~ OF Il degrees below fa'at tndicateo oS luf
one suspended nbnyo ground; hut II, toward
early dawn, cloud should pass over, foteFpns-
tIlE itatll betrccn the ground nnd The eliza! SKY
aboye' tue temperature, hs shown ny N ther,
tioMetcr on tlis Rfoana woplh f!sc 10 mat ol
tile a!r turroundlug the suspenacu tfcr'noGe-
ter, nearly So From this It will to sccn that
tlie cartn, % has bccn pciore stntea, s co''t'n-
ually radiattng u: sur1aee heat INTO sraee: nnd,
Wien NE NJ cloud i'1ter?oscs 'tseit .Stween 1he
l1Hi 'cnca its tctnnefaturo Is again ralsed. Tho
reader WIZ hear III mind this iact TINT we 'lcser
sec ,fosi alter c'ouay hleat, aha lof u1e feh-
III 1his "atcrY @ sapor IN M NC ar mr. ls not what s wo
cal log. cio''ts nor mist, but Is part u Tho
aaf l!o'noesneonsly oaitn*ca through u. Wefr
1Dt LOT ins ,apnr '1 %n'e' IT, ators os e.esHs tis
faalassoh from t'e earth. tIc lnttrs woall oe SO
refrigerated q as 70 ocso'ne unl''i'abltahle' sucI
Is already the case with the H'oen which. 20 far
rs hltnalt kea cay r.. uetsranne. Is acad planet.
a 70 ath wet ~ 9 aa vn!sy ior
ilsla 't our sanofons ataos M pnesr. At the earlh
Is To-day. 90 no doubt Tue noou has been; a,m an,
IL I'm ~Ien by y,soa y"
its M g o,n nj internal lcs,. i ssi hive 40 tar e9 X
nanstco ltsei! ~ e. f. oe uAaolel 10 support Sege-
taglo H.. anu s.n an'ma. ,,.,o m.e. -. mr.. ..,,
lhe ordinary obscrsnt1one OF lite VIII 70 lar
70 conTnce any one y Of & IT. @ correctness Of u'c
moist Dry isY. when tie asMosphsFs is heavy r;
OF surchargea With yapor, IL Is alwnYs very
warnl,-oue iseitnEa IN the surrounding air
being t,lht OF pefson IN q steam-oath: anu
| whys Because tie Taulatlhn OF warm ar from
the earth Is stonpco near Its surface by this
excess oi vapor II tEe surrounding ar, md wo
Arn l!Icsalls III hlcath'uatn. .
btit snoposc we transport ourselves IN ihae.
lnAtl0H 10 BufIlltlE 6lEuB OF TnE Degfct
Of Sahara. lhcrc wo sna,! lind ot at'nosnhcre
almost totally deprived Of its OF l
| per cent OF fapor, ana Will nothing to
| 0hstruet INC sun's rays by DAY nor tic