C 46 3 
Jan. 24. laft, about Two of the Clock in the Afternoon j 
about which Hour Mr. townley (whofe Name you well 
know) obftrved his Barometer to fall to 27,80 Inches, 
which, he fays, was remarkably low, 
I find it will be neceflary for me to add Two Columns 
more to each Month's Obfervations, viz. One for the 
Thermometer, another for the Flying of the Clouds, 
which oftentimes fly in a Point different from the Winds, 
efpecially before the Wind Ihifteth its Courfe. Moun- 
tains, ®c. may caufe fome Variation, but as little at 
TJpminfier as almoft any where. This laft Column will 
be neceflary, among other Ufes, to fliew the Reafon 
why the Mercury varies fometimes : As fuppofe the Wind 
was in the Southerly Points, and the Clouds flew from 
the Northerly ; /the rifing of the Mercury would readily 
be accounted for. 
IV. ^ ; 
