ne day. This morning a balloon was sent up
without thread and with the flag device to which I have alluded. It
went slowly but steadily to the north and so over the Barne Glacier. It
was difficult to follow with glasses frequently clouding with the
breath, but we saw the instrument detached when the slow match burned
out. I'm afraid there is no doubt it fell on the glacier and there
is little hope of recovering it. We have now decided to use a thread
again, but to send the bobbin up with the balloon, so that it unwinds
from that end and there will be no friction where it touches the snow
or rock.

This investigation of upper air conditions is proving a very difficult
matter, but we are not beaten yet.

_Wednesday, August_ 30.--Fine bright day. The thread of the balloon
sent up to-day broke very short off through some fault in the cage
holding the bobbin. By good luck the instrument was found in the
North Bay, and held a record.

This is the fifth record showing a constant inversion of temperature
for a few hundred feet and then a gradual fall, so that the temperature
of the surface is not reached again for 2000 or 3000 feet. The
establishment of this fact repays much of the trouble caused by
the ascents.

_Thursday, August_ 31.--Went round about the Domain and Ramp with
Wilson. We are now pretty well decided as to certain matters that
puzzled us at first. The Ramp is undoubtedly a moraine supported on
the decaying end of the glacier. A great deal of the underlying ice is
exposed, but we had doubts as to whether this ice was not the result
of winter drifting and summer thawing. We have a little difference of
opinion as to whether this morainic material has been brought down in
surface layers or pushed up from the bottom ice layers, as in Alpine
glaciers. There is no doubt that the glacier is retreating with
comparative rapidity, and this leads us to account for the various
ice slabs about the hut as remains of the glacier, but a puzzling
fact confronts this proposition in the discovery of penguin feathers
in the lower strata of ice in both ice caves. The shifting of levels
in the morainic material would account for the drying up of some
lakes and the terrace formations in others, whilst curious trenches
in the ground are obviously due to cracks in the ice beneath. We are
now quite convinced that the queer cones on the Ramp are merely the
result of the weathering of big blocks of agglomerate. As weathering
results t