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Show BA That the more norteerly Places find greater Alterations than the n re fouthern ; andthat and near ’em, there islittle within the Zrog or no Variation of the Mercuryat al Dr. Bealobferves, That, cateris paribus, the Mercury is higher in cold Weather than in warm, and ufually | r at Morning and Evening than at Mid-day That the Mercuryis higher in fettled and fair Weather than either a little before, or after, or in the Rain; and that it generally ieeelower after Rain thanit was before Etat chance to rife higher after Rain, it is coil y follow’d by a fettled Serenity. ‘That thereare frequently greaat Changes in the Air without anyperceptible Alterations in the Baaromete As to Prec Dr. Haijey has found, fhould blow a Gale of Wefterly Wind, andar the fame Time an Eatterly Wind in the [nip Sea; or if in Fraveceit fhouldblowa Northerly Wind, and in Scet/ grantted that th a Southerly, it muft be f the Atmofphere im- pendent over i would thereby be exhaufted andattenuated, and the Meret ny Wvould fubfide, and the Vapours which befe im thofe Parts of the Air of equal Griavity with themielves, would to the I z The greater Height of the is oceafion’d by two contrary Wi rofo mulated; that the Air muft neceffarily be attenu when and where the faid Winds c blow, and that moreor ie accordingto their Violence: Add to which, that the horizontal 7 W thirty- fifth Welterly and South-wefterly almoft alw Trade; fo that d; fo that they de> and in their Fall, Particles, they cording to of two coneby ays fror 1 Cylind ace wherethe Air of that or two, the Quickfilver has fallen; and then upon the|Sun’s breaking out again, it has rifen efore. oe rainy Weather it ufes to fall, the Reafon of which obvious, becaufesthe Air is lightened by fo much as falls, in fnowy Wealikewife; but not fo muchas in Rains: And he had fometimes obfery’d it, upon a hoar Froft falling in the Night. windy Weather he found it generally to fall, and that more univerf:ally, and m difcernibly than upon Rain, which he att buted to the Winds moving collaterally, ar fi ing it to prefssfo much dire@tly c W 1 we fee in Swi nad never foundit ighbourhood of the Pole, and that again g check’d by a Southerly Wind, at no great Diftance, and fo heap’d up, muft of imes upondife cfilver to fall » without any at Home, look’d abroad, 1 tc broken Clouds or otherwit *d not far tho’ not with e Air being thenlightened, the heavier Air with them, where not, might have in Part difcharg’d itfelf on that lig in a violent Storm, or when the is at the very loweft, it then vis breaks, and emits {mall Particles (as he e had more than once obferv’d) ) he looks upon as a kind of and confequently at all Times of nt, it jis moreorlefs upon the Fret. In this Diford r ofthe Qui gines it to haveits Parts co the Quickfilver then emits fre Air into the Tube, whic of the Air, and ty; the Quickfilver Andhe lent of ferv'd ve three Y State, : equently is neceffar thereby. And t tion of a heated Tron actic'd in the purging of ilver rifes in the Tube L 10t and frofly be faid to be in a » Open, and expand upon or others, where as twenty-nine Inches upon an and con- but then it y eding | E Air j to be acco1 1 for by what y thiny Weather, when Clouds had come for fome confiderable Time, as fuppofe an Hour the fame Poi and E.S. E being no‘co hauft or accumula tinues much in the Remark, the / mut neec this Ifland, and confeq muft ftand high gh, blow. en the Af. E Pennies and thenthe northerly Winds ing the condens’d ans pendics s Air from the an eafy Gale of V e€ By rent Circumf ances: northerly Places, as at Stockholm greater than at Paris (compar’d by Mr, Pafcal] becaufe the more northerly Parts have ufually le Storms of Wind than the more /o fhould fink lowerinthat in the Places above rmlittle Drops of at one 1ime bring it to an Equilibrium, as we {ee Water runs“the fafter for having a great Declivity. 4. The Variations are greater in the more riable Winds being the Caufe riations of the Height of the 4 the Winds cc ore » inclines it to ee tis fure to be check’d oy aco ‘ing | ight the Vapours foon as it reaches oe Ocean ; ed thereby, being beier than the Medium Hours after a long continu’d Storm of Southweft Wind. The Reafonis, becaufe the Air being very muchrarefy’d by the great Evacuations that fuch continued Storms make thereof, the neighbouring Air runs in the more {wiftly, to Neceffity, make the Mercury in fuch Cafe ftandhigher in the other I This Remark, thatt Variation near the Equ all others confirm the Hypoth y ftands the cpu thanat at another, euthisTater ina thought might be imputed partly to the Va- pours rais’d ‘by the Sun, and making the Air heaviier, increafing the elaftick or {pr xy Power Which latter, he rather adds, becaufe = had fometimes obferv’d in Sun- to rife an Inch and a half in lefs than fix I the S ; come in as to fupply the Evacuation made byfo fwift a Current, fo on of the Vapours dy it comes to be at For the Northern Parts of Germany, Denmark, Sweden, Norway, and all that Trad, from whence North-eaftern Winds come, are fubje& to almoft continual Froft all the Win- After great Storms of Wind, when the Merciry has. been very low, it generallyrifes again very faft fays, he aS obferv’dit er conceives, ‘That the prin- Motion of the Air ng fo oeas it is, may, of the Rife and Faill of the Mer- in all Probability, take off fome Partofthe from the ble Winds which are Preffure the reof andthegreat 1e Temperate Zones, and whofe i fon why here in England is moft ac ad do not coninto ee {o as to form Rain, ot s to be, uncertain h ral Confequence of th I lodging in the Ain i Diftanceoff: per Parts of the ops104 phere, to reduce the Cavity made by this Contraction to an Equies juin. That the Falling of the Mercuryportends ther, which attends Southerly or Wefterly Winds, with Rain, or f the Mercury. ftormy Winds, or both 3. abe ‘That i Storm the Mercurybeginning to rife,.is a pretty fure Sign that it begins to the very 1 ‘ind. abate. Mr. Patrick obferves, That the Falling of For the 'Traét of the Re the Mercury in hot Weather prefages Thun- Surface, wherein thefe Wi That when foul aeather happens after ing all round the Globe the Fall of the Mer ae holds long: Air which is’ Jeft behind, ai f fair Weather fucy after its Ri fe alfo obferves,“That within the f and near them, thereis verylittle or no Variation of the Height of the Mercury out of the Northern and North-eaftern Quarters, orat leaft unlefs thofe Winds blowat no great ing in the Ocean, the cury muuft needs be prefs'd to a more thanordir it; and as a concurring Caufe, the fhri g of the lower Parts of the Air into leffer Room by Cold, muft needs caufe a Defcent of the up- 3 from the Barometers, And the That in Sun-thiny Weather it rofe, and commonly the clearer, the more; and this he condens’d, andin that Stateis brought hither~wards by thofe Winds ; and being accumulated bythe Oppofition of the Weflerly Wind blow- rds ‘the North-eafterly Wind. Date BA 3. In calm frofty Weather, the Mercury generally ftands high, becaufe, as heconceives, it feldom freezes bat when the Winds come ter, and thereby the lower Air is very much That the Rifing of the Mercury forebodes fair W othe r after foul, and an Eafterly or TTR TEI BA rms) it ever only in Weather, he found lich he afcrib’d to rs in the Air, more or Side the Zrof Which |
