19"] INVERTED TEMPERATURE 399 
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 readied 
again for 2000 or 3000 fect. 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 
