30 
MEMOIR OF DR. WALKER. 
height of tho distant lands. Nothing else could 
render the Isle of Skye and the Isle of Man at the 
same time visible. At three such views, the naked 
eye might extend from the one extremity of Britain 
to the other. To stretch the eye over so many dif- 
ferent seas, over such a multitude of islands, and 
such various countries in different kingdoms, is per- 
haps a scene that can nowhere he beheld in Europe 
but from the summit of Jura. 
“ During the time that our fire was kindling, we 
constructed a barometer, when the mercury stood 
at twenty-seven inches and one-tenth. Fahrenheit’s 
mercurial thermometer was then put into the boiling 
water, in a kettle which had been made for the 
purpose ; and, after many repeated immersions, was 
found to stand constantly at two hundred and seven 
degrees. We left the summit of the mountain at 
seven o’clock ; and left it indeed with regret, having 
been so much delighted. We descended, not with- 
out some difficulty and danger, upon tho west side, 
where the mountain is very abrupt, and about mid- 
night arrived upon tho Sound of Islay, at the place 
from which wc set out. Here we again repeated 
our experiments. The same barometrical tube was 
filled, and at one o’clock in the morning the mercury 
stood, at the level of the sea, at twenty-nine inches 
and seven-tenths; the same height precisely at 
which it stood the preceding morning at seven 
o’clock. And as the air and weather had been alto- 
gether serene, without the least perceptible altera- 
tion during the intermediate time, there was reason 
