Camp was pitched for lunch in the vicinity of many gaping holes leading down into darkness, places where the bridges over large crevasses had fallen in. Mertz prepared the lunch and Ninnis and I went to photograph an open crevasse near by. Returning, we diverged on reaching the back of the tent, he passing round on one side and I on the other. The next instant I heard a bang on the ice and, swinging round, could see nothing of my companion but his head and arms. He had broken through the lid of a crevasse fifteen feet wide and was hanging on to its edge close to where the camera lay damaged on the ice. He was soon dragged into safety. Looking down into the black depths we realized how narrowly he had escaped. As the tent was found to encroach partly on the same crevasse, it may be imagined that we did not dally long over the meal. In the afternoon the weather became clear and fine, but, as if to offset this, the broken surface became impassable. The region was one of serac where the glacier was puckered up, folded and crushed. After several repulses in what seemed to be promising directions, we were finally forced to camp, having ten miles to our credit. Whilst Mertz fed the dogs and prepared hoosh, Ninnis and I roped up and went off to search for a passage. All around, the glacier was pressed up into great folds, two hundred feet in height and between one quarter and a third of a mile from crest to crest. The ridges of the folds were either domes or open rifts partly choked with snow. Precipitous ice-falls and deep cauldrons were encountered everywhere. To the north the glacier flattened out; to the south it was more rugged. In this chaos we wandered for some miles until a favourable line of advance had been discovered for the march on the following day. The first three miles, on the 22nd, were over a piece of very dangerous country, after which our prospects improved and we came to the border of a level plain. There Mertz slipped on his skis, went ahead and set a good pace. Although the sky had become overcast and snow fell fitfully, our progress was rapid towards the rising slopes of the land on the eastern side of the glacier. Over the last three miles of the day's journey the surface was raised in large, pimply masses surrounded by wide fissures. Into one of the fissures, bridged by snow, Ninnis's sledge fell, but fortunately jammed itself just below the surface. As it was, we had a long job getting it up again, having to unpack the sledge in the crevasse until it was light enough to be easily manipulated. Despite the delay, our day's run was sixteen and a half miles. At 8 A.M. on the 23rd everything was in readiness for a fresh start. Moderate drift and wind descended from the hills and there were yet three miles of hidden perils to be passed. With the object of making our advance less dangerous, various devices were employed.