g from the lower cloud at 2,300 feet, they saw,
what Green would have foretold, an upper stratum of dark cloud above.
Then they made excursions up and down, trying high and low to verify
these conditions, and passing through fogs both wet and dry, at last
drifting earthward, through squalls of wind and rain with drops as
large as fourpenny pieces, to find that on the ground heavy wet had been
ceaselessly falling.

A day trip over the eastern suburbs of London in the same year seems
greatly to have impressed Mr. Glaisher. The noise of London streets
as heard from above has much diminished during the last fifteen years'
probably owing to the introduction of wood paving. But, forty years ago,
Mr. Glaisher describes the deep sound of London as resembling the roar
of the sea, when at a mile high; while at greater elevations it was
heard at a murmuring noise. But the view must have been yet more
striking than the hearing, for in one direction the white cliffs from
Margate to Dover were visible, while Brighton and the sea beyond were
sighted, and again all the coast line up to Yarmouth yet the atmosphere
that day, one might have thought, should have been in turmoil, by reason
of a conflict of aircurrents; for, within two miles of the earth, the
wind was from the east; between two and three miles high it was exactly
opposite, being from the west; but at three miles it was N.E.; while,
higher, it was again directly opposite, or S.W.

During his researches so far Mr. Glaisher had found much that was
anomalous in the way of the winds, and in other elements of weather. He
was destined to find much more. It had been commonly accepted that the
temperature of the air decreases at the average rate of 10 degrees for
every 300 feet of elevation, and various computations, as, for example,
those which relate to the co-efficient of refraction, have been
founded on this basis; but Mr. Glaisher soon established that the above
generalisation had to be much modified. The following, gathered from his
notes is a typical example of such surprises as the aeronaut with due
instrumental equipment may not unfrequently meet with.

It was the 12th of January, 1864, with an air-current on the ground from
the S.E., of temperature 41 degrees,, which very slowly decreased up to
1,600 feet when a warm S.W. current was met with, and at 3,000 feet the
temperature was 3 1/2 degrees higher than on the earth. Above the S.W.
stream the air became dry, and here t