Nina, Eileen, and Selwyn formed a lagging and leisurely rear-guard, though always within signalling distance of Boots and the main body; and, when necessary, the two ex-army men wig-wagged to each other across the uplands to the endless excitement and gratification of the children. It was a perfect week-end; the sky, pale as a robin's egg at morn and even, deepened to royal blue under the noon-day sun; and all the world--Long Island--seemed but a gigantic gold-green boat stemming the running purple of the sea and Sound. The air, when still, quivered in that deep, rich silence instinct with the perpetual monotone of the sea; stiller for the accentless call of some lone moorland bird, or the gauzy clatter of a dragon-fly in reedy reaches. But when the moon rose and the breeze awakened, and the sedges stirred, and the cat's-paws raced across the moonlit ponds, and the far surf off Wonder Head intoned the hymn of the four winds, the trinity, earth and sky and water, became one thunderous symphony--a harmony of sound and colour silvered to a monochrome by the moon. Then, through the tinted mystery the wild ducks, low flying, drove like a flight of witches through the dusk; and unseen herons called from their heronry, fainter, fainter till their goblin yelps died out in the swelling murmur of a million wind-whipped leaves. Then was the moorland waste bewitching in its alternation of softly checkered gray and shade, where acres of feathery grasses flowed in wind-blown furrows; where in the purple obscurity of hollows the strange and aged little forests grew restless and full of echoes; where shadowy reeds like elfin swords clattered and thrust and parried across the darkling pools of haunted waters unstirred save for the swirl of a startled fish or the smoothly spreading wake of some furry creature swimming without a sound. Into this magic borderland, dimmer for moonlit glimpses in ghostly contrast to the shadow shape of wood and glade, Eileen conducted Selwyn; and they heard the whirr of painted wood-ducks passing in obscurity, and the hymn of the four winds off Wonder Head; and they heard the herons, noisy in their heronry, and a young fox yapping on a moon-struck dune. But Selwyn cared more for the sun and the infinite blue above, and the vast cloud-forms piled up in argent splendour behind a sea of amethyst. "The darker, vaguer phases of beauty," he said to Eileen, smiling, "attract and fascinate those young in experience. Tragedy is always better appreciated and better rendered by those who have never lived it. The anatomy of sadness, the subtler fascination of life brooding in shadow, appeals most keenly to those who can study and reflect, then dismiss it all and return again to the brightness of existence which has not yet for them been tarnished." He had never before, even by slightest implication, referred to his own experience with life. She was not perfectly certain that he did so now.