I 9941 
which is frequently feen in frofts and in cool nights in 
Summer. To thefel may add the rednefs pfthe Sna 
({b as to be eafily look'd upon, and moon, a confiderable 
time before their fetting or after their rifiag.Now fincc I 
have had occafion to make obferv.ations oftheBa^pkppei 
I have always taken notice of a^I the fe, wiLea t^ 
cury was riling and coafequently/^b the increafe of fthc 
Atmbfphcre's gravityj /1 have then frequently obferved 
how inconfpicuous and as it wereSmokie the Horizon & 
remote Hills would appear tho' there we re no Clouds in 
the Air, and in what a * tremuldus motion remofe objed:^ 
leem'd to be, aod how copioufly the Steams did arife 
from waters and mariflies,^ and how r 
looked on the Sun was for a confiderable time before fet- 
ting. But on the contrary when the Mercury has been 
low in the Barofcope and fo the Atmofphere's gravity lef^, 
T have obferved none of th'efe effe(3:s, but the remote 
Hils were clear arid diitin£t' ;ju'nlefs fome times a Cloud 
had falln down upon them,)and no wa.ving to be obferv- 
ed in the Air nor Steams from the waters. I know not 
whether I may add here a eonjedlure about the great 
light & the Capr^e faltantes which are fome nights to be- 
feen in the North. I have taken notice of them ufualiy 
when the Mercury has been high in, the Barofcope, and 
then they appearing in that quarter of the Heavens. 
where the Sun is at that time below the Horizon, this has 
given me occafion to think, that perhaps the Steams of 
Vapours may have afcended fo far in the Atmofphere as; 
to be beyond the Earth s fhadow in that part of the Hori-; 
zon, and fo by refrad'ing the beams of light towards us 
to occafion that light and thole Capr^ faltantes.lt may. 
be confidered alfo whether the red skies in the Evening, 
which betoken fair weather,; do not proceed frona tha; 
height of the Clouds occafioned at that time by theea-^ 
creafe of the fpecifical gravity of the Atmofphere. 
Now as to the falling down of the Vapours again^ it is 
cifibla 
