Yet this novel emotion had nothing to do with the wind.  Indeed, so vague was the sense of distress I experienced, that it was impossible to trace it to its source and deal with it accordingly, though I was aware somehow that it had to do with my realization of our utter insignificance before this unrestrained power of the elements about me.  The huge-grown river had something to do with it too—­a vague, unpleasant idea that we had somehow trifled with these great elemental forces in whose power we lay helpless every hour of the day and night.  For here, indeed, they were gigantically at play together, and the sight appealed to the imagination.

But my emotion, so far as I could understand it, seemed to attach itself more particularly to the willow bushes, to these acres and acres of willows, crowding, so thickly growing there, swarming everywhere the eye could reach, pressing upon the river as though to suffocate it, standing in dense array mile after mile beneath the sky, watching, waiting, listening.  And, apart quite from the elements, the willows connected themselves subtly with my malaise, attacking the mind insidiously somehow by reason of their vast numbers, and contriving in some way or other to represent to the imagination a new and mighty power, a power, moreover, not altogether friendly to us.

Great revelations of nature, of course, never fail to impress in one way or another, and I was no stranger to moods of the kind.  Mountains overawe and oceans terrify, while the mystery of great forests exercises a spell peculiarly its own.  But all these, at one point or another, somewhere link on intimately with human life and human experience.  They stir comprehensible, even if alarming, emotions.  They tend on the whole to exalt.

With this multitude of willows, however, it was something far different, I felt.  Some essence emanated from them that besieged the heart.  A sense of awe awakened, true, but of awe touched somewhere by a vague terror.  Their serried ranks, growing everywhere darker about me as the shadows deepened, moving furiously yet softly in the wind, woke in me the curious and unwelcome suggestion that we had trespassed here upon the borders of an alien world, a world where we were intruders, a world where we were not wanted or invited to remain—­where we ran grave risks perhaps!

The feeling, however, though it refused to yield its meaning entirely to analysis, did not at the time trouble me by passing into menace.  Yet it never left me quite, even during the very practical business of putting up the tent in a hurricane of wind and building a fire for the stew-pot.  It remained, just enough to bother and perplex, and to rob a most delightful camping-ground of a good portion of its charm.  To my companion, however, I said nothing, for he was a man I considered devoid of imagination.  In the first place, I could never have explained to him what I meant, and in the second, he would have laughed stupidly at me if I had.