112 Aqueous Vapour Atmosphere. 
set in so dense that we were detained there 
for an hour or more; at last a sudden gleam 
of sun broke through and gave us a view of 
the highest Pike, about half a mile off: with 
great haste we got to it before it was again 
concealed, so as to take the barometrical and 
other observations. ‘The barometer stood at 
26.7; the thermometer was at 55° in the fog, 
and. consequently that was the dew-point at 
the same time. At one time we separated a 
little, and the mist coming on suddenly we 
lost one another; some called out, and were 
led astray by the echo, thinking it was their 
companions answering the call. 
N. B.—We left Low-wood Inn early in the 
morning, when the lake Winandermere, and 
the surrounding country were covered with 
a dense fog, but the sun was just visible 
through it. At 6A. M. I observed the tem- 
perature of the air to be 60°, whilst that of 
the lake was 66 andthe air calm. Hence 
the mist was easily accounted for. Next day 
at 10 P. M. the air was 46° and the Lake 48>, 
that is 12° higher, but there was no fog on it, 
because there was a strong breeze, 
We learned a few days after, that there 
was a great thunder-storm in some parts of 
Cumberland and Westmoreland, the adjacent 
