One evening, when we were all at dinner, there was a sudden noise which drowned the rush of the blizzard. It was found that several sledges had been blown away from their position to the south of the Hut, striking the building as they passed. They were all rescued except one, which had already reached the sea and was travelling rapidly toward Australia. Mertz, Bage and I had taken advantage of a lull to ascend the ice-slope to the south, and to erect a flag-pole at a distance of two miles. Besides being a beacon for sledging parties, it was used for ablation measurements. These were determinations of the annual wasting of the ice-surface, whether by evaporation, melting, or wind-abrasion. Webb and Stillwell, assisted by others, had commenced to build the Magnetograph House. Dr. Chree, of the British National Physical Laboratory, had arranged that the German Antarctic Expedition, several observatories in low latitudes and our own Expedition, should take special "quick runs," synchronously, twice each month. A "quick run" was a continuous, careful observation made over a period of two hours, on a more searching time-scale then usual. Until the Magnetograph House was established this could not be done efficiently, and so the construction of this hut was pushed on as quickly as possible. Many other schemes required our attention, and there was not a spare moment for any one. Though we chafed at the delay in sledging, there was some consolation in the fact that the scientific programme was daily becoming more and more complete. CHAPTER VI AUTUMN PROSPECTS As far as we could see, the inland ice was an unbroken plateau with no natural landmarks. From the hinterland in a vast solid stream the ice flowed, with heavily crevassed downfalls near the coast. Traversing this from north to south was a narrow belt, reasonably free from pitfalls, running as a spur down to the sea. To reach the Hut in safety it would be necessary for sledging parties returning from the interior to descend by this highway. The problem was to locate the path. Determinations of latitude and longitude would guide them to the neighbourhood of Commonwealth Bay, but the coastline in the vicinity of Winter Quarters, with the rocks and islets, would not come into view until within two miles, as above that point the icy slopes filled the foreground up to the distant berg-studded horizon. Delays in reaching the Hut owing to the difficult descent might have serious consequences, for provisions are usually short near the conclusion of a sledging journey. The necessity of making artificial landmarks was, therefore, most obvious. Already we had a flagstaff two miles to the south. It was now my intention to run a line of similar marks backwards to the plateau.