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n./ have not in all this time found the extrearaest changes of theQuick-silver to amount to more, than to af, or to Inches, at most.

ia. Very osten I have found great Changes in the Air, without anyperceptible change in the Barometer ; as in the dewy Nights, when themoisture descends in a great quantity, and the thickneß sometimes seemsto hide the Stars from us: In the days foregoing and following, the va-pours have been drawn up so invisibly, that the Air and Sky seemed veryclear all day long. This 1 account a great Change between afcending and.delcending Dews and Vapours fwhich import Levity and Weight) and.between thick Air and clear Air : which changes do sometimes continue, inthe alternative course of day and night, for a week or fortnight together ; andyet the Baroscope holding the same.

13. Sometimes (l say not often ) the Baroscope yields not to other verygreat changes of the Air. As lately (Dec. 18.) an extraordinarybright and clear day; and the next following quite darkned, sorae Rainand Snow falling; but the Mercury the same: So on high Winds and Calms.the same.

14. I do conceive, that such as do converse much sub /lio, and walk muchabroad, may find many particula rs much more exactly than I, who have no

\ leisere for it, can undertake. To instance in onc ofmany, Die. , 6 1 66 s.

was a clear cold day, very stiarp and strong East Wind, the Mercury verynear 30 Inches high, about 3 in the Afternoon I saw a large Black Clouddrawing near us from the East and South East, wich the East Wind.The Mercury changed not that day, nor the day following; the Stars and.most of the Sky were very bright and clear till Nine of the Clock; andthen seddenly all the Sky was darkned, yet no Change of Weatherhappened; Dec. 17. the Frost held, and ’twas a clear day, till about.Two of the Clock in the Afternoon ; and then many thick Clouds appearedlow in the West; yet no Change of the Weather here; the Wind, Frost,and Quicksilver, the same, Dec. 18. the Mercury feil almost t of an,inch, and the Sky and Air so clear and bright and cold with an East Wind,that I wondred what cou’d cause the Mercury to descend. I expected itfhould have afcended, as ufually it does in such clear Skies. CasoallyI sent my Servant abroad, and he diseovered the remote Hills, aboutaoMiles off, covered with Snow. This seemed to manifest that the Air, being.discharged of the Clouds by Snow, became lighter.

17. 1 have seldom seen the Change to be very great at any, one time, so.that I once wondred to see, that in one day it sobsided about \ of an Inch.

16. Jan. 13. 1 661 the Mercury stood (as it did also the day before)

a quarter above 30 Inches; yet both days very dark and Cloudy,. some-times very Thick and Misty Air ; which seldom falls out.For,for the most partI see it higher in clearest setled weather, than in such cloudy and misty Fogs.This thick Air and darkneß hath lasted above a Week ; lately more cold,and East and North East Wind.

17. I have not yet found any such infallible Prognosti,ck of these changes

of

n. iv. P. 16z.