The New York herald. [volume] (New York [N.Y.]) 1840-1920, 1853-08-09

or the cohesion acrg surface il about one bali ~ha
1t is within the mass But his value gives rarif-
cation aiso along tho surface well as sloug tina
romal, it Will theI e:cIe be much diminished SO ~ to
become less than one half the general value rhxs
bcth along the porHa and along the surface weak
beson is neeei sary ehsIaetcrioc OF tse soald,og
layers of material both fluid and solid. The
suit thus reached respect to mass vacuo, rouli
not Re greatly affected in the ordinary atmosphere.
1t is SOC ewbst remarkable that Poissens capillary
theory stated BY Mossott in Tay lors Scestifc Me
noirs is bss.d Essentially Oh an apsy sis Of the fluid
face in which the hsvDg Of The normal layer is totally
overo. ked and ,be cohesion along ths surface Iceland
be The in the msss the only haviog
been tsAen ito account have not Poston work
but f. is singular that Aossot should either have INSIDE
s"c 10 oversight have failed 10 detect it in Poisson
il he really committed it. II is radical dcfect-even
using Poison's ovn hypothess-and must directly
affect, or even iDySlsaie, his whole theory.
esdpg discussion. Fluid surfaces in state weak
cohesion compared with fud interiors: hence par
italy ainolhe condition Of rarif cten exists aioug
such bounding surfaces. IT, then, we aaimilate
beat to . molecular repusion, Ia customary, we
see at oLce that Is the temperature is raised
the weak tcahesion in the surface layer will be wholly
overcome long before the Il heated to that point
which will ovesmsster its internal cohesion. Hence the
surface molecules i'll freely pass off vapor while
strong cohesion st exists throughout tho entire mass
Evaporation thus gees on at surfaces, at all tempera
lures above that which Just sufices to the
weak surface cohesion. This constitution structure
necessarily chsrac ezirg the limiting lay fluids Is
the true and fu explanation Of evaporation in ali its
terror exterior surfaces, enclosed virtually
to answer this description, might be heated far above
=; -. .has p rs Doinns' VIC rvs ina eD'nIion
- ~. e eteIs ~ a.. .a'e III evspoiauon siArA IN
hhp, W ". sasses, s.u Nv-ms Win lhe eKpahclpg
S asi en.lsiy irseo leT Az ooooes,
a-re 49, hn,d opon soe ~ 40 ponny tupe
i noint ,ntn ~ 10 .H h, ~ sl aooe Ia s,
IL 20 team i'm ~ sxnIo WY Az ~ % sou.a ua a.
scr,hed Nv no, Nv 4, III. s,rai.,. 49, - .ha
ae Chmie et AZ phys;aue y fo,Ior ~ r. .. aa h
aesuct;ons from .f;s oanst;t,.;or - ~ ' aIs
su,tsce Indeed xa do ,ot ~ ou xans,- ~
Ma hxiro fn,c.d srorn vi .~as~;aaa..
cluae sn,n;r;c.Ily ,ba. ,bara raae - 80. o,I
quality in sn,f. cea hcb ,osI.. a., iss
=, o,cb move ,ssd;r on thana ,S =; a,a P W.
see Zoo ho~ nt,e,,s ysIlscions a,a Al. ~ ,,n .a, ~
.l,y tatan ss naaasrr;no and cnhss .h , au
fact onv rcspls 81 tho weak cobss ON IN .nfsca
which with tbe fae moh,iiiv NJ en,J nar.s I'll. a.
nlsns all tbe oh erved ro. ui.s This fn sxnl.;ns
700 nefect billing Of toa nercnrv In hs ha.
NAL en- II sdbere al The tor With aucb ,ena.i.v n
nlains ant M the So,csd An If
Amid, n sbich = cesavaftd aud seaI,d wben bot dos
not shrink in cooling Tor long time but AZ last brsass
~ OBSERVATION-DISCLOSURES ,h, 4, w.. $3.50 49, -, ~.
sion before yeiding Prof Hsnrys elegant experiments
with bubbles In which by measuring the tension Of
the enclosed air. he 10 able ceduce first the com press
ing force ard thence the cohesion Ct the uid film with
very great value furph an indie peudeat confirmation
Of The sane general views. We NAV remark that
the heterogeneous Of the outer layers would
destroy the mobility OF their parts give film Ike
character Of the fluid suIisce while all within this hln
would have free mobility. This with the additional fact
Of craving inward OF the outer layers oy tho unbaanc