the past ten days Alhubel had basked in the radiant midwinter weather proper to its eminence of over 6,000 feet. From rising to setting the sun (so surprising to those who have hitherto associated it with a pale, tepid plate indistinctly shining through the murky air of England) had blazed its way across the sparkling blue, and every night the serene and windless frost had made the stars sparkle like illuminated diamond dust. Sufficient snow had fallen before Christmas to content the skiers, and the big rink, sprinkled every evening, had given the skaters each morning a fresh surface on which to perform their slippery antics. Bridge and dancing served to while away the greater part of the night, and to me, now for the first time tasting the joys of a winter in the Engadine, it seemed that a new heaven and a new earth had been lighted, warmed, and refrigerated for the special benefit of those who like myself had been wise enough to save up their days of holiday for the winter.
But a break came in these ideal conditions: one afternoon the sun grew vapour-veiled and up the valley from the north-west a wind frozen with miles of travel over ice-bound hill-sides began scouting through the calm halls of the heavens. Soon it grew dusted with snow, first in small flakes driven almost horizontally before its congealing breath and then in larger tufts as of swansdown. And though all day for a fortnight before the fate of nations and life and death had seemed to me of far less importance than to get certain tracings of the skate-blades on the ice of proper shape and size, it now seemed that the one paramount consideration was to hurry back to the hotel for shelter: it was wiser to leave rocking-turns alone than to be frozen in their quest.
I had come out here with my cousin, Professor Ingram, the celebrated physiologist and Alpine climber. During the serenity of the last fortnight he had made a couple of notable winter ascents, but this morning his weather-wisdom had mistrusted the signs of the heavens, and instead of attempting the ascent of the Piz Passug he had waited to see whether his misgivings justified themselves. So there he sat now in the hall of the admirable hotel with his feet on the hot-water pipes and the latest delivery of the English post in his hands. This contained a pamphlet concerning the result of the Mount Everest expedition, of which he had just finished the perusal when I entered.
"A very interesting report," he said, passing it to me, "and they certainly deserve to succeed next year. But who can tell, what that final six thousand feet may entail? Six thousand feet more when you have already accomplished twenty-three thousand does not seem much, but at present no one knows whether the human frame can stand exertion at such a height. It may affect not the lungs and heart only, but possibly the brain. Delirious hallucinations may occur. In fact, if I did not know better, I should have said that one such hallucination had occurred to the climbers already."
"And what was that?" I asked.
"You will find that they thought they came across the tracks of some naked human foot at a great altitude. That looks at first sight like an hallucination. What more natural than that a brain excited and exhilarated by the extreme height should have interpreted certain marks in the snow as the footprints of a human being? Every bodily organ at these altitudes is exerting itself to the utmost to do its work, and the brain seizes on those marks in the snow and says 'Yes, I'm all right, I'm doing my job, and I perceive marks in the snow which I affirm are human footprints.' You know, even at this altitude, how restless and eager the brain is, how vividly, as you told me, you dream at night. Multiply that stimulus and that consequent eagerness and restlessness by three, and how natural that the brain should harbour illusions! What after all is the delirium which often accompanies high fever but the effort of the brain to do its work under the pressure of feverish conditions? It is so eager to continue perceiving that it perceives things which have no existence!"
"And yet you don't think that these naked human footprints were illusions," said I. "You told me you would have thought so, if you had not known better."
He shifted in his chair and looked out of the window a moment. The air was thick now with the density of the big snow-flakes that were driven along by the squealing north-west gale.