On the 13th of March the auxiliary sledge was sent back, thus reducing the caravan to a dozen sledges and ninety-eight dogs, which in a long line passed over a vast plain covered with great rugged blocks of ice, as though they had been thrown down confusedly by a giant's hand to bar the way. The wind was north-east, the cold intense, fifty below zero, not to be particular to a degree or so, for, as Cagni says, when the temperature is below twenty-two, and it is impossible to use a screen or a magnifying glass, the mere fact of approaching to read the scale on an unmounted thermometer sends it up a couple of degrees, and when the temperature is below fifty-eight an approach makes a difference of three or four degrees. So cold was it that the sleeping bags were as hard as wood, and the men got into them after much effort, not to sleep but to feel their teeth chattering for hours, the only warm parts of the body being the feet clad in long woollen stockings. "There are patches of ice on our knees," says Cagni, "like horses' knee-caps, and we have others, both large and small, sometimes thick enough to be scraped off with a knife, everywhere, but especially on our cheeks and backs and in all places where the perspiration has oozed through." Amid such surroundings the camp must have seemed somewhat out of place. When a suitable site was chosen the first sledge was stopped, and near it the three other sledges of the third detachment were drawn up at a distance of about ten feet from each other. The sledges of the second detachment as they came up formed a second line, those of the third forming another. The tents were pitched between two sledges, generally those in the centre, the guy ropes being fastened to the sledge runners, those at the ends to an ice-axe stuck in the ice. The sleeping bags were then unpacked, the cooking stoves taken out of the boats, and everything arranged under the tent. The thin steel wire ropes to which the dogs were tethered, when unharnessed, were stretched between the sledges away from the tents. While the men were taking the dogs out of the harness, which always remained attached to the traces on the sledges, and tethering them to the steel ropes, one of the guides took a chosen victim to some distance from the camp, and felled it with a blow from an ice-axe, then opened it, skinned it quickly, divided it up into ten shares and distributed these to the dogs, already destined to undergo the same fate, these being the weakest and most ailing—in short, this was the elimination of the unfit.