ridid^atibnf fër à?-1- in à dafky Àé.'^Wfe'-w # fife
i’sJ përéëivabl'ë by*à 4èngJ-and- incfeàfing ■ track h f fight xf^bïl- thé“
wlifëf/SPÉIP UMf, bëfnrid* à #rfp- ürtdtr faff,11 appears Itffoiftôfo?
tbh'confidetfelé dîfftaiieè'. \
It î^fojfàrsflf ^fâeSj EfôWévdfj that (bis igttëohS cfMgëftée kf
to be Fe'èn-iri the ffe'à ;Lbuè it frécfaentlÿ bàpptefîs àt ffo -approaching1
altëfàriôW dFtlië Wèathiei4, àïfd 6tf feè ebhhge df thé winds. t&
w'ëfb, fffietT the foliée pfrtîclëkàf thé lfeà àiè tht'ôWti kîfoâ kind ôr
férfoèntftiOrf. ïër fike ihànnéfj ffeë ttoïthétn-lïghts dbfoot âlw&ys1
appëàày ' Btfi! only at pfoticnlar féafonlr,: when tlié fiâline Vbiptifdiè
ofifeefoir' fotë a^itafèd b ^ a riattitàh fertftëfrtàfloft; îfot the proper
ràtidlialë bftMs fét Metttotiofo fond àfcet^bEthfe jâfîàè pàrticlês t>£
tM!$Êà' âftid'ai|i,#i>ëft‘ kîiüMï tptüihbft
tkihgs this Mtatë. îîdtfeÿçt^'it'^'d gëàtfalabferva-
tipfl among' èxpëfbfottrtîfeîFï nfodj^toA,' knd fKe ïi&ëffftéft who
hve/dàüg fbë coâft b ï Nbf^ayj fhifot^efofeè
app^^tÔ'Me weffiW^li^îï II d pfcgiidlte',dft'à féHfh-Wëft' WfodiJ
which 'cddmnf tire b f (^;itàjÉtMïïte^ that fofeé régions
of the âir, a^iÿeH as‘bf tfïé fefphbbuttétte: fàffitë!'cbtpuffctek foôfo
feim. others, and theft/ ât beffoliï tîittë^, tféâdé d”' fortîiëfttr, fold
dîffufè à ÎW^t ^ p ü |H dïë dif. J Mhcfoppldfo feoft ïrëtpiêfttiy
prëfegès die “ ado^é-^e^d^^^ of* ifoiathef, yët, wibie • &
oftèri à cprifidérable fntëréal,’ heferif fl&thâhgè âftüafly takëè
place. It iis however cprtfoày thât thé Cüld tëgfejte éf thè à-if
contribute gréâdy tô die fchâiîgë aüd’ boiftefOtîfîlds of thb: Weather
; parSdiltrly whép tte n p r t|^ ^ «
violent ftorm,. fow M z n Ê c ^ i t l y eî£peéted/
though tlJweather may for a* Wéëk aftfr fom&me favbtable to
navigators, before the M g cornes o n .^O f tfrVl hâVC ïèen
many inftances. . ; M ; -fo(. • . ' •. . '
In this fermentation bf thé air thé cold is abated, fold if it extends
îb far as to rarify the air ol thé atmofpheîè, this is called
mild w ith e r: : And when, by the elevatidft of'the B f W f
is the, mort çomoreflM againft thaï’ w tà ^ .is fatturatfed
with nitrous exhalldons, fo ‘èiât the wmd in the înfeïiot ait ffets
the lower part of die cold region in tome motion, dits câtlfes
thdfe cornÿfcaJtism^ in! Ae akv which are called *h?Li;pprthr%ht.
In thofe years, whèfï !thë Wihfet is tttrttfuàBy fëtëfë, ^hefe not-
1 2 - ' ‘ them
them rMgfkte are feMotn or ever feeh; thë: air being i too far op-
prefiêd and, c^ndenlfed by’ fist» iptesnfce|s. of the cold,, to force it-*
felf UjKSvatds- ^ainfi the flittous region, and ctenjmunicate to it
that motion which prodlèes thë nörth-light, before the lower air
again expands itfèlf by lre£h fermentations.”
i. < -Thus for M. Hteitman, wfxpfe obfervations in fome meafure
confirm the general opinion of its being a kind of fulgur brutum,
or -hghtfting without t-hunefer; confxfting, ‘ as lightning generally
does, of inflamed iulphureous particles,1 but; burhiiig' with much
lefs Vehemence. Dr. Nicholas Boerner, M his Ph'yfies, chap. xi.
p. z84"i's:eXprefely of this opinion/ viz.'“ that the north-light is
nothing but falme, fulphureous vapours^ kindléd in the upper air,
by'a change it undérgoes in auturrtn, fpring, and at other times,
when tfie fim has not power fuffieient to rarify and diiperfe thefcf
fulphureous particles.” Or, to make ufe of the' words of the celebrated
Wolfius, tc it is a fubftahee asjyet immaturè for lightnings
bf which he treats m '-a--particular diflèrtatidnf ^ , 'fan imperfeét
témpeflf ;aS'“he'‘S l P :ï t - - i h ^ * f i ^ W a d M a l 'Reflbfti^is:
öri- the works of nature. ’ ~-:-*This ~ opinidnt',rri‘ay b# further cofro^
boraten -byj*^the following circumftanee: Some perfons of credit
who RVb ^ this - country,-. B^ve' aïfered me/that thefè-'Fulgura
fptiëb|tlfdfb hbt'always' without a crack of found, for in a glaring
north-light, and calm weather, a diftinft folmd lias ’been heard.
With an explolion in the'air, like the fudden breaking of-thé icèi
Another opinion concerning the north-light1, <5fs®,' that it is' no
iriore than'a*mere*réfratSon, or VefleCtion of a flame iffoing from
certain vulètóèes, whieh, in favour óf' this'echjeétüfe, are fop*
pofed to-‘lie feëyoöd Greenland, near the north-pole. But tliis
péfidda i® .too weak to-buSd any thing on, or tb^be- generally
admitted. There are many, however, whb eonfider the northern
lights only sis- & mere refleftion, or -reverheration, tho’ hot from
the flame of any vulcanees, but from the fon itfelf, when -far be^-
low our horizon it meets with fome evaporating è3;oudsi at foch
a height-to:'to be within thè' oehtiefc- bf the fon’s beams in their
afcent.
T-Ms Is ;;^e p in io n , which'Dr, ^enttfl^ b f Prentflau d e i
dares in Ids third publication o f Mifeellaneous Obfervations,
drawn from the belebfotéd M..Eulera enquiry into the norih-
. %ht,