Results.

In all, temperature profiles were measured in 11 holes. Of these the first two were shallow and of limited use, the last included readings at a few depths only, and one contained an equipment error induced by last-minute haste. The remaining 7 profiles should provide good information.

A radiation profile was measured once only, and was hampered by cloud.

While Benseman and Shirtcliffe were engaged on these measurements, Popplewell investigated and collected samples from melt streams at the eastern end of the lake, and also a valuable set of samples from one hole in the lake. Chloride analysis was completed on these samples in the field as insurance against their loss, and further analysis will be continuing for some time in the laboratory.

The initial conclusion is that the high temperatures in the lake are due to the trapping of solar energy, but the details are not yet clear.