For this very jest, amongst all the rest,

moon, preternaturally large and rather more than half full, heaved itself above the distant horizon and flooded the ice-cap with its pale and ghostly light, laying down between itself and our feet a bar-straight path of glittering silver grey. We watched in silence for a full minute, then Jackstraw stirred. Even before he spoke, I knew what was in his mind. "Uplavnik," he murmured. "Tomorrow, we set off for Uplav-nik. But first, you said, a good night's sleep." "I know," I said. "A traveller's moon." "A traveller's moon," he echoed. He was right, of course. Travel in the Arctic, in winter, was regulated not by daylight but my moonlight. And tonight we had that moonand we had a clear sky, a dying wind and no snow at all. I turned to Joss. "You'll be all right alone?" "I have no worries," he said soberly. "Look, sir, can't I come too?" "Stay here and stay healthy," I advised. "Thanks, Joss, but you know someone must remain behind. I'll call you up on the usual schedules. You might get a kick out of the RCA yet. Miracles still happen." "Not this time, they won't." He turned away abruptly and went below. Jackstraw moved across to the tractorwe didn't say another word to each other, we didn't have toand I followed Joss down to the cabin. No one had moved an inch, as far as I could see, but they all looked up as I came in. "All right," I said abruptly. "Get your stuff together and pile on every last stitch of clothes you can. We're leaving now." We left, in fact, just over an hour later. The Citroen had been lying unused for the better pan of a fortnight, and we had the devil's own job getting it to start. But start it eventually did, with a roar and a thunderous clatter that had everybody jumping in startlement then looking at it in dismay. I knew the thoughts in their minds, that they'd have to live with this cacophony, this bedlam of sound assaulting their shrinking eardrums for no one knew how many days to come, but I wasted little sympathy on them: at least they would have the protection of the wooden body while I would be sitting practically on top of the engine. We said our goodbyes to Joss. He shook hands with Jackstraw and myself, with Margaret Ross and Marie LeGarde, and, pointedly, with no one else. We left him standing there by the hatchway, a lonely figure outlined against the pale light of the infomation on cannon a300 digital camera steadily climbing moon, and headed west by south for Uplavnik, three hundred long and frozen miles away. I wondered, as I knew Joss was wondering, whether we would ever see each other again. I wondered, too, what right I had in exposing Jackstraw to the dangers which must lie ahead. He was sitting beside me as I drove, but as I looked at him covertly in the moonlight, at that strong lean face that, but for the rather broad cheekbones, might have been that of any Scandinavian sea-rover, I knew I was wasting my time wondering. Although nominally under my command, he had only been lent me, as other Greenlanders had been lent as an act of courtesy by the Danish Government to several IGY stations, as a scientific officerhe had a geology degree from the University of Copenhagen and had forgotten more about the ice-cap than I would ever knowand in times of emergency, especially where his own pride, and he had plenty of that, was concerned would be extremely liable to do what he thought best, regardless of what I thought or said. I knew he wouldn't have remained behind even if I had ordered him to- and, if I were honest with myself, I was only too damned glad to have him along, as a friend, as an ally, and as insurance policy against the disaster that can so easily overtake the careless or the inexperienced on the ice-cap. But even so, even though I quieted my conscience as best I could, it was difficult to push from my mind the picture of his dark vivacious young schoolteacher wife and little daughter, the red and white brick house in which I'd lived for two weeks as a guest in the summer. What Jackstraw thought was impossible to say. He sat immobile as if carved from stone, only his eyes alive, constantly moving, constantly shifting, as he probed for sudden dips in the ice-cap, for differences in the structure of the snow, for anything that might spell trouble. It was purely automatic, purely instinctive: the crevasse country lay, as yet, two hundred and fifty miles away, where the ice-cap started to slope sharply to the sea, and Jackstraw himself maintained that Balto, his big lead dog, had a surer instinct for crevasses than any human alive. The temperature was dropping down into the minus thirties, but it was a perfect night for arctic travela moonlit, windless night under a still and starry sky. Visibility was phenomenal, the ice-cap was smooth and flat, the engine ran sweetly with never a falter: had it not been for the