Held Service as usual.
This afternoon went on ski around the bay and back across. Little or no wind; sky clear, temperature −25°. It was wonderfully mild considering the temperature—this sounds paradoxical, but the sensation of cold does not conform to the thermometer—it is obviously dependent on the wind and less obviously on the humidity of the air and the ice crystals floating in it. I cannot very clearly account for this effect, but as a matter of fact I have certainly felt colder in still air at −10° than I did to-day when the thermometer was down to −25°, other conditions apparently equal.
The amazing circumstance is that by no means can we measure the humidity, or indeed the precipitation or evaporation. I have just been discussing with Simpson the insuperable difficulties that stand in the way of experiment in this direction, since cold air can only hold the smallest quantities of moisture, and saturation covers an extremely small range of temperature.
Monday, May 29.—Another beautiful calm day. Went out both before and after the mid-day meal. This morning with Wilson and Bowers towards the thermometer off Inaccessible Island. On the way my companionable dog was heard barking and dimly seen—we went towards him and found that he was worrying a young sea leopard. This is the second found in the Strait this season. We had to secure it as a specimen, but it was sad to have to kill. The long lithe body of this seal makes it almost beautiful in comparison with our stout, bloated Weddells. This poor beast turned swiftly from side to side as we
