, 1879-08-09

10 illustrate The rasc suppose o,.r Residence 10
iln located nj ono e's,l of, ana >hnslectc,f
ami il.at we draw o''r supply Of fresh mir from
II. II will ba Rcrn nt nntu that tue MIR drnwn
through, sl,rl. Il s'lbtcrrancan chamber, deep M
it II In thc bowels Of 'ft enrtt, ,l,at lie ht
mucl, jowrr tcnlptratnrp In w4rm weather
than that nbovc cronn1.--ti, fart, would l'a At OF
tlrar The normal temperature Dctweeh altllferrn-
ntan mil solar heat, OF about 10 t'or, abore zero
NIL te yesr rnunl. -......
nj air info this cnvc ut one end at n tefnpcra.
tire Of 1lO degrees, mud fully saturated With
moisture, It must, n It ndgnnccs through this
fublcrrancan passage, be cooled to the tenpera,
lcT. @ aboyc ' x.ro. As consequence Of
reduction OF 40 deg. Of heat VIC shall have rc.
sl,1ced Ly rrnciptiatton tse amount OF vn'ns that
thu air casies fron, full sa:nrattmon m or 100 PEI
this ninollnt rticn It reaches our dwelling At the
niher r,l o the cave. tho surplus Of vapor har-
itg bccn left in thc rave: -.. .
Ar containing Il to 70 pet cent Of the amount
NJ yaror that u ran carFr ts. IN tic language Q!
.rirnee. dry; !! 1t coutatns 45 TO 20 per rent Of
that amount It IA vcry DRY; and II no more than
q ner ccnF. It Is tntcneclv dry.
S"n Fys s s iisnss t eava Sst"fsn sn h' a n:
] forner C. ea.o '' We '0D '"ke " tho '' Al, fr"1 s"s
t11G sablcrrsnean chamber or care dry. fresh,
vrsteh Ut threc.iur.,,, Of ,ln rapor that /. car
| rel fntO the cave In passing. through It. and Its
tre'tl for this element Il s'tch that Instcat! Of
t!tposltinE rs rnlh'rs In t,n roon, when It reaches
/ It, hre,r part!cic of moisture IN the room u at
once absur'c!i hy It, AMI still it Is ary. whole.
snne oarhctc,-.nclI ns we sometimes trarel
tlous. .ns Of mtIts to obtain. .Thr prinrlpIe in.
volgea Y th'. 1,; .lsn9sl,1nn q ,noatnrc y sc
tn roIh wea''Hr Is deposited on tho pnncs Of
| glns4 In Dtsr windows aid congc8'cd Into hoar
frost. It Is By tlc cooling IT 'sm air against
3, pari Of the moisture, l'ecante IN
this coo1ed rendition IL cannot cnrry Il,
atni II adhrrcG to ihr glass as nlrr1dv explained.
II IS alto substantially The safa prtncsulr by
wtlirh dew Is ienoStte,i at Hntl ncar thc surface
OF the rartll, hnl BY congrln'nn hrcnolcs froat.
We will now rcycrsr the ncurr, mid supposs
the outdoor fcmneraturc 10 hc at zcrt,. anil the
! nlr fn!s saturated ~ betorc. Now. thc reader
1ruat nat lose sight al tln' important fart t!lat
In. air at zern mar hc fully saturated a,mt yet
not contain mora than n '1'rre fraction of shr
| yapor required to taturafe the same air nt
Temperature OF fG0 tle!:, Fahrenheit. We will
now pass It through ,l,c raro.--or. II tlc rca,cr
nleasc through one Of the subsnsth afr duets
,,Gecr'ocd IN previous communication:
I'VE cannnt, gil Of ns. avail! ourselves nf
the benc1t Of this cave, uni The aut-earth
duct will answer the same purpose). Bv con-
rcction and contact With The wultA, Aonv. asnl
covering the temperature OF the nfr Is ratsctl to
ti'atEf the cave or duct OF say to 10 degrees
above zaso. It's capacity for absorbing t1astntc
n ft,crchy greatly Increased, mil It enters our
imaginary dwelling At shc rnl Of tue cave with
thateycr amount Of wafer It ran absorb as IL
gn.s nlnng INT viii enter Tic dwelling at nt,olt
20 degrees at,oye, zcso which, as We have alre1dy
| ahpwn, Il VERY tfrY afr.
] haze thus cn,lcayoresl to explain some Of t',c
liygromctrir phenomena Of uir. ynror. uu1 hcnt-
and IN nn!sl: nttt to lie reader how may md
Inay not tcmp"r ihc air 1T o,1s rooms. nnl the
Consequences wlitrl! tnay result from violation
of The laws ot health. It. H. fact
Tint no ona, viii dr!s that our ien'rnnycc
Of thrsc lIygicnc laws Ia sourrc OF u1anY ut
The Ills tirst flesh Is hclr to-, II VIC will ft H..
yestsat" md inform ourselves Of lie physical
laws Of onF bring, VIZ may save ourselves much
suffering and trouble.
windows 0i o,sr sleeping aolrtulcnts IN hot
summer nights II we rnt!uot afford tue luxury Ut
Ice. hardly need remind alv sensible prrson
that narrower much Of luxury It may seem
hen nc arc In the enjoyment of II. alecplng III
night a!r cannut l,e fuatled On uuy hygienIc
principle. md should be avoided II pot *Lir.
On accnuIt Of tile radiation oi terrestrial heat
tntn space during The nirht tiir cooling proccss
Il auau,uulatnE at or near the earth :n1 thc nr.
charged rs 1t must be wiih n'n!sturs almost or
g.!tc 10 tho dew ,oIn;, Or that Of saturntnn. Is
allowed to cntc- our httnses a.ul wo iful our
selves sleeping III damp rooms. With a
tendency to Initiate nur first narcnts. who, bath
sng III the rnul xephyrs at Eden unincuabcrcd
n'nl unprotected By sheet or eo0nlc!pn',c, NC
exposa ourscvcs 10 this damn mir. mn! neural
f,a- rheumatism, inflammation ii the bowels,
arrhen mud ln,ly nthcr tsiseuacs arc tl,p result.
Thts kind of cxunsure Is csrectaiy aeyGrr on
| children, nn,l this Is unc ot itc calsea of Al
great tcr cept Of infantile mortality at this
season III ttc yrar.
Ia ssum up,"a rs lawyers say. II re would
preserve naE hcaItI, VII should krca the air III
olr houses at al! tires-a,n1 esne4falty It: thN
nght-tlornugbty .!rr: not with tint dsYncss
which We experience from Using nit itl-atlyfsad
hot-air furnace heated to rclncss, btls rather
TINT ,lryncss which comes frnsn proncF lsgrn.
metric condition Of tlle osphcrp, Whrt, Satnrn
does not atwRrs provide, nntl whrl may nut IL.
wayB 10 obtained without the application Of 4
proper system of ventilation 10 our hutl.ttngs
CIR. RAsuALI~