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THE ASCENT OF MOUNT EREBUS. with the hypsometer determination at our camp at the top of the old crater, calculations made by us show that the summit of Erebus is probably about 13,370 feet above sea-level.

As soon as our measurements had been made, and some photographs had been taken by Mawson, we hurried back towards our camp, as it was imperatively necessary to get Brocklehurst down to the base of the main cone that day, and this meant a descent in all, of nearly 8,000 feet. On the way back a traverse was made of the main crater, and levels taken for constructing a geological section; we also collected numerous specimens of the unique felspar crystals, and of the pumice and sulphur.

On arrival in camp we had a hasty meal, and having hurriedly packed up, shouldered our burdens once more, and started down the steep mountain slope. Brocklehurst insisted on carrying his heavy load, in spite of his frost-bitten feet. We followed a course a little to the west of the one we took when ascending. The rock was rubbly and kept slipping under our feet, so that falls were frequent. After descending a few hundreds of feet, we found that the rubbly spur of rock, down which we were ﬂoundering, ended abruptly in a long and steep névé slope.