While Ninnis rested before we made a start, Mertz and I re-arranged the sledges and their loads. A third sledge was no longer necessary, so the one usually driven by Ninnis, which had been damaged, was discarded and all the gear was divided between the other two sledges in nearly equal amounts. When the work was completed, the rear sledge carried an extra weight of fifty pounds. As, however, both food for men and dogs were to come from it, we reckoned that this superadded load would soon diminish. On we went, during the afternoon, up a steep ascent. Crevasses were so numerous that we took measures to vent them. Some were as much as a hundred feet in width, filled with snow; others were great open holes or like huge cauldrons. Close to the windward edge of some of the latter high ramps of neve with bluff faces on the windward side stood up like monoliths reaching twenty-five feet in maximum height. In the evening a field of neve was reached and we felt more placid after the anxiety of the preceding hours. During the passage of a snow-filled valley a dull, booming sound like the noise of far-distant cannon was heard. It was evidently connected with the subsidence of large areas of the surface crust. Apparently large cavities had formed beneath the snow and the weight of ourselves and the sledges caused the crust to sink and the air to be expelled. The sun appeared late in the day and, as it was almost calm, the last few hours of marching were very pleasant. At midnight we camped at an altitude of one thousand nine hundred feet. A light east-south-east wind was blowing as the sledges started away eastward on the morning of December 14. The weather was sunny and the temperature registered 21 degrees F. Mertz and I were happy to know that Ninnis had slept well and was feeling much better. Our march was interrupted at noon by a latitude observation, after which Mertz went ahead on skis singing his student songs. The dogs rose to the occasion and pulled eagerly and well. Everything was for once in harmony and the time was at hand when we should turn our faces homewards. Mertz was well in advance of us when I noticed him hold up his ski-stick and then go on. This was a signal for something unusual so, as I approached the vicinity, I looked out for crevasses or some other explanation of his action. As a matter of fact crevasses were not expected, since we were on a smooth surface of neve well to the southward of the broken coastal slopes. On reaching the spot where Mertz had signalled and seeing no sign of any irregularity, I jumped on to the sledge, got out the book of tables and commenced to figure out the latitude observation taken on that day. Glancing at the ground a moment after, I noticed the faint indication of a crevasse. It was but one of many hundred similar ones we had crossed and had no specially dangerous appearance, but still I turned quickly round, called out a warning word to Ninnis and then dismissed it from my thoughts.