weak, how weak we can only realize now, but we got in good marches, though slow—­days when we did 41/2, 71/4 63/4, 61/2, 71/2 miles.  On our outward journey we had been relaying and getting forward about 41/2 miles a day at this point.  The surface which we had dreaded so much was not so sandy or soft as when we had come out, and the settlements were more marked.  These are caused by a crust falling under your feet.  Generally the area involved is some twenty yards or so round you, and the surface falls through an air space for two or three inches with a soft ‘crush’ which may at first make you think there are crevasses about.  In the region where we now travelled they were much more pronounced than elsewhere, and one day, when Bill was inside the tent lighting the primus, I put my foot into a hole that I had dug.  This started a big settlement; sledge, tent and all of us dropped about a foot, and the noise of it ran away for miles and miles:  we listened to it until we began to get too cold.  It must have lasted a full three minutes.

In the pauses of our marching we halted in our harnesses the ropes of which lay slack in the powdery snow.  We stood panting with our backs against the mountainous mass of frozen gear which was our load.  There was no wind, at any rate no more than light airs:  our breath crackled as it froze.  There was no unnecessary conversation:  I don’t know why our tongues never got frozen, but all my teeth, the nerves of which had been killed, split to pieces.  We had been going perhaps three hours since lunch.

“How are your feet, Cherry?” from Bill.

“Very cold.”

“That’s all right; so are mine.”  We didn’t worry to ask Birdie:  he never had a frost-bitten foot from start to finish.

Half an hour later, as we marched, Bill would ask the same question.  I tell him that all feeling has gone:  Bill still has some feeling in one of his but the other is lost.  He settled we had better camp:  another ghastly night ahead.  We started to get out of our harnesses, while Bill, before doing anything else, would take the fur mitts from his hands, carefully shape any soft parts as they froze (generally, however, our mitts did not thaw on our hands), and lay them on the snow in front of him—­two dark dots.  His proper fur mitts were lost when the igloo roof went:  these were the delicate dog-skin linings we had in addition, beautiful things to look at and to feel when new, excellent when dry to turn the screws of a theodolite, but too dainty for straps and lanyards.  Just now I don’t know what he could have done without them.