Aqueous Vapour Atmosphere. 113 
counties, during the time we were on Broad- 
Cragg Pikes; we heard no thunder except 
one clap at9 A. M. as we were beginning 
the ascent. 
=070— 
1812.— Observations on Helvellyn. 
July 6th.—A fine day, but cool for. the 
season. Light, fleecy clouds above the sum- 
mit. 
Ht. above the 
adjacent valley Temp. Dew-. Temp. of 
& lake, in yds. of air. point. Water. 
3: P.M. Summit ........ S55A1..2 MOP neerseee oa —- 
a ait sities 3: ac eT ae eT 
WH ASg Oo eat 
aobbdetezsss Another Spring 650......49 cse43 cece 
decbacstare Another Spring 420.....:.— seeec43 cece AbT 
oe a In the Valley _O......... 56h WG iaaas — 
At this season I found for the first time a 
large snow-drift on the N. E. side of the 
summit in a deep ravin. It measured about 
20 yards by 30, and was 3 or 4 yards deep in 
places: a hard compact mass, so that standing 
upon it made no impression. I took a quan- 
tity down and found the dew-point in the 
valley frequently to be 46+ 
P 
