ae 
The di fri of Deux- Ponts counts ne anes 
éommunes, and os 5s a inhabitants, upon a territorial extent 
of 1795 kiliom 
DEW, Deapy es water depofited: by the atmofphere-h im 
confequence of fimple cooling, ‘commonly by night, and in 
drops too {mall to Ni ies until cule on the leaves of 
Leis and other o 
Cafaubon derive aie word from the Greek Siw, which 
is ftridly J dew; thew being the perfonal pronoun fuffixed 
y contraction. “This is quite as probable, neverthelefs, that-a 
fubftantive, an{wering to our Anglofaxon primitive, | ge 
ek. 
rife to this verb in the Gre 
w is a phenomenon proper to clear weather. . It begin 
ft céniftant,.in vallies aad 
np olle&tions of water ; an 
sicands on thofe coat of the-furface which are dgthed with 
vegetation. i:It. is often fufpended when.rain is. approaching. 
as likewile i in windy: weather, and before ‘thander, ttorms =, 
In general it does ot fall yea elofe , veil of clouds, how- 
ever flight, remain t after fun-fet.., Hts.a Appr pach, 
in the eatenfive valley watered by ss Hames ‘pretants t the 
fter m day th there - As 
gradually Haney a nike od ae a pe 2oup haze; Tifing 
fometimes to a confiderable height, “and: ‘ofte a tinged ‘by, thé 
fetting {un with a fine gradation of red cae violet fhades 
This is the ace Neath pat faintly: et in its 
defcent. ew isa o be. found onthe. é 
time that this haze ies ie tone coplpies ua; a on sdbing 
iia is Proportisacd to the denfity and perimanehéé of ¢ 
att 
The quantity of dew, thus aan ee idly r 
different’ "places," ‘and at differedt: Ro camcgie atte place ; 
nor does it fall upon bodied a every k if icitedmiasshy 
In sae of thefe,p iemene eeetal Hiypothefes “have 
, but no fatisfa theory ° s* 
pectin ug.them We tha i endeavour to’ give our 
readers a ‘clenridee ‘of the fabject, > Ratifig whatever belongs 
to it in the following ‘ordér. “We thal; ‘inthe ‘firtt place, 
defcribe the fas which have en sfcriint by means of 
-experiments | and obfervations 3 fecor pe ies bri riefly 
méntion the principal Bie that pe offered’ 
their explanation ; a nd, la e fhall tao fomd'Sccounts 
of A ar r Oecurrences,” ivhick: feem to belong to the prefent 
ae ae 
I. ae this ifland the déwi is ‘Sbferved (likethe drops of a 
niifling. rain upon the leaves ‘of - afs - other i baad 
upon wood; glafs, porcelair, upon ~ the *eart 
Which is thereby: fees vedere fenfibly, moift, ) more 
copioutly in fpring an mer mornings’; than at aes 
fimes of the Ries utu fowever, and even: in 
r, it frequently es under the concufrence of pa = 
Ae ia nero hae an abundant dew i is depofited int 
the a a the ni 
car; a fome ae a are fo opious, 
great meafure to PP - peged of rain, yews ldo m 
falls in thofe places. ae of thefe effects is 
po 
larly during the night 
lan We oat has, owe al sblerreos chat in molt coun ei 
154 a 
disnfiderabite ‘depbfition ‘of :moifture takes “place not ‘long 
pee the fettivgs of the fun; but foon after the depofition: 
roceeds with a flackening pace, until the a of the fun in 
the morning. “oBut the regularity ‘of théfe effeGs. is fre- 
quently counteracted by accidental cireamances fuch as 
the.chati npetof win refence of clouds, 
~ 4, In clon udy: woetaventhere is little or ‘no a ees depofted 
The greateft quantity-of it is obferved in a morning fu 
quent to a.clear, ftill, am cool night, ee haa pie a 
so warm nae 
re 
other. ith this apparatus 
oxpoted t e oe pray ae i ae that the lower furface of 
the loweft pane of glafs was firft wetted with dew, ‘then its 
upper furface, ene the lower furface of the pane next above 
it was wettedy and fo 6n, until all the panes to the very top. 
of the tad deralbscatue: covered withdew. He alfo tried the 
experiment with picoes-ofseioth-inftead of panes of glafs, and 
the’ refult was fimilar ‘tothe above. He weighed all the 
pieces of cloth on the monhing. following their expofure, ar & 
” found that-ehdfe! which-:Had been placed lowermoft, had im- 
bibed . more! a a — ich had been fituated . 
higher up ;:che ‘owns,’ however, th coe efult of this expe~ 
riment didnot pe ce fatisfadtory asthe preceding. In ge~ 
neral. the-lower parts of bodies that are expofed to the 
ces air, aré-firft covered with dew. 
“0; Mulcieibrock repeated the above. mentioned ids a 
: u Fay, with this difference however, viz. that 
placed ‘ie adders, &c. upon a plane covered with fheet fee. 
but the a sab wae attended with the like refult. 
7. By ing: ve leaves of plants that are covers with 
dew ay expofing glafs veffels, or otherwife, the dew 
water ed be collefted, and on-examination it will be found 
to bea pretty pure water; unlefs duft and other ‘accidental 
impurities. happen to be gathered. with the dew water. ¢ 
particular cafes are recorded, in which the dew was-found to. 
differ Sma eae pure water; but thofe accounts will 
be noticed herea 
'$ The moft fingulae phenomenon which attends this 
qu ueous cat deataese | is, that the dew is not depofited upon 
all kinds of: fubftances indifcriminately ; it falls upon certaim 
fome even ‘not at all. - 
found to-feceive the dew in.a greater or.lefs degree, or not-at 
all, according to certain circumftances. Thefe. anomalous 
effects not appearing at prefent: reconcileable. to any--fatisface- 
ory theory, it is'incumbent upon us to ftate the principal 
refults: of the experiments that ae been made on purpofe by. 
various philofo} hers; ip order that the ingenious reader;may 
Pp P g 
form whatever opinion he thinks. beit upon the fubje 
. Gu The dreps of dew attach soa es to giafs, cryftals, 
and porcelain, much more readily than to.other bodies 
to aa come the leaves of ve fia, wood, - Ne aad 
when varni common earthen-ware ;- e dew. 
adheres leat of all to all forts of metallic bodies 
Mnufchenbroeck obferved that on a leaden aie dew 
eonieald on every kind of fubftance, and fo it, did on a table. 
nacertain garden. The forty-lecogd: slau of the Philo- 
 fophical TranfaGtions, page 112,;‘contains fome> obférvations 
on dew, made by Dr. L. Stocke, upon the leaded platform 
a atower. He expofed feveral fobttances, and 
us kinds ; it fell lefs copionfly upon certain pieces of wood, 
aud 1 leait of ‘ll upon metals, excepting, however, fuch as were: 
rough 
